Yak Sbi Clerk 2018 Coaching Twenty-Four Hours One - Uncomplicated Involvement (Shortcuts & Utilization Tests)

Hello friends, I am Aparna. As I promised yesterday, hither is the Day 1 cast of our SBI Clerks 2018 Classes. As nosotros direct hold less time, I don't desire to waste materials much fourth dimension on useless topics. So I am direct starting i of the most of import in addition to hard topic of Aptitude section, Simple Interest. In banking exams, you lot volition instruct at-least i interrogation from Simple Interest / Compound Interest. I volition endeavour my best to explicate everything inwards details in addition to volition aid you lot solve SI problems on your own.

Simple Interest Shortcuts

Basics - Simple Interest Introduction

What is Interest ?
Suppose you lot badly demand Rs. 100/- to purchase something. But you lot don't direct hold that money. So you lot volition enquire your friends or soul else (Say Mr. X) for that money. But why should Mr. X plough over you lot the coin ? What payoff volition he instruct past times giving you lot the coin ?

So, to convince him, you lot volition country that you lot volition provide his Rs. 100/- inwards i or ii years in addition to hope him that you lot volition pay or thus additional amount for the usage of his money.

Then he gives you lot the coin in addition to volition asks you lot to pay additional Two rupees per twelvemonth for using his money.


You grip for this scheme (because you lot badly inwards demand of that Rs. 100/-) in addition to direct hold the money.

After ii years, you lot got a Rs.100/- from somewhere in addition to wanted to provide the coin of Mr. X. So directly you lot demand to pay his 100 along amongst the additional coin you lot promised (Rs. 2 per year) for keeping his Rs. 100/- amongst you. That means, you lot should pay additional Rs. four (2+2) for ii years. This additional coin is called every bit Interest. If the involvement is calculated on same amount of money, it is called the Simple Interest. The Simple Interest volition endure the same for all the years. 

But or thus times Mr. X asks you lot to plough over involvement for the additional amount too. That means, past times the halt of the 1st year, you lot volition direct hold to pay Mr. X Rs. 102 (100 + 2  rupees interest). So from the minute twelvemonth onwards, Mr. X volition enquire you lot to pay involvement for this Rs. 102 instead of Rs. 100. This involvement is called every bit Compound Interest. 

Definitions :

• Simple Interest : The amount charged past times the lender for giving you lot his coin for a specific amount of time.
• Compound Interest : Here also same. But hither the lender calculates the Interest on Interest if the given fourth dimension exceeds

We shall verbalise over virtually Compound Interest inwards tomorrow's lesson. Now let's function amongst Simple Interest.

Note : Please proceed a Note Books for the practise purpose. Trust me, only reading this lesson won't aid you lot inwards whatsoever way. You demand to practise on your ain to endure proficient inwards Simple Interest problems.

Simple Interest Formulas

1.

SI = PTR / 100

Here,

SI = Simple Interest
P = Principal
T = Time inwards years
R = Rate % per annum

2. P = 100I / TR

3. T = 100I / PR

4. R = 100I / PT

5. A = P + I, where Influenza A virus subtype H5N1 = Amount

6. P = 100A / (100 + TR)

7.  If a amount of coin becomes x times inwards T years at R % p.a (per anum), thus TR = 100 (x-1)  or TR = 100x- 100


8. If a amount of coin becomes n times inwards t years in addition to northward times inwards T years, then t / T = (n-1) / (N-1)

9. If the involvement is the same inwards ii cases, thus p t r = P T R 

10. If the principal is the same inwards ii cases, then i / tr = I  / TR 

11. If the fourth dimension is the same inwards ii cases, then i  / pr = I / PR

12. If the charge per unit of measurement is the same inwards ii cases, thus i / pt = I / PT

13. If a amount is set at R % p.a higher charge per unit of measurement in addition to the additional involvement fetched is Rs. I, thus amount = P = 100I / TR

14. If a amount amounts to Rs. X inwards T years in addition to Rs. Y inwards t years, thus the involvement for i year

= I 1 = (X Y) / (T t), Sum = P = X-I1T or Y-I1t in addition to Rate % pa = (100I1) / P

15. If the interests are the same inwards or thus cases, the ratio of the sums is same every bit the ratio of the values of the reciprocals of T x R.

16. If the amounts are the same inwards or thus cases, the ratio of the sums is same every bit the ratio of the values of the reciprocals of (100 + T x R)

Now let's start working on Simple Interest problems.  

Simple Interest : Examples & Practice Problems  

Model 1 :

1. Find the Simple Interest on Rs. 7500 inwards four years at 15% per annum ?
1. Rs. 3000
2. Rs. 3600
3. Rs. 4500
4. Rs. 4800
5. None of these

Solution :  

Here, Principal : Rs. 7500

Time = four Years

Rate = 15% 

So I = PTR / 100

=> (7500 x four x 15) / 100

Tip : When always you lot come across zeros inwards denominator in addition to numerator which are gear upward to endure cancelled, simply  avoid writing them. It volition relieve time. 

Here 75 x four x fifteen = 75x60 =  4500 (Option 3 is the answer).

Now I am sharing 3 problems which are precisely same every bit higher upward occupation (only numbers different) for your practice. Solve them in addition to part your answers inwards comments section.

Practice Problems on Model 1

2. Find the Simple Interest on Rs. 7560 inwards 5 years at 12% per annum ?
1. Rs. 4000
2. Rs. 4200
3. Rs. 4500
4. Rs. 4536
5. None of these
3. Find the Simple Interest on Rs. 7500 inwards 3 years at 16% per annum ?
1. Rs. 3000
2. Rs. 3600
3. Rs. 45000
4. Rs. 4800
5. None of these
4. Find the Simple Interest on Rs. 17500 inwards half-dozen years at 7% per annum ?
1. Rs. 7350
2. Rs. 7750
3. Rs. 7800
4. Rs. 8275
5. None of these

Model 2 :

1. On what amount of coin volition the Simple Interest endure Rs. 2000 inwards 5 years at 8% per annum ?
1. Rs. 4000
2. Rs. 4500
3. Rs. 4800
4. Rs. 5000
5. None of these

Solution : 

Here, they are cry for for P 

So, P = 100I / TR = (100 x 2000) / twoscore = 5000

Practice Problems on Model 2

2. On what amount of coin volition the Simple Interest endure Rs. 1440 inwards four years at 7.5% per annum ?
1. Rs. 4000
2. Rs. 4500
3. Rs. 4800
4. Rs. 5000
5. None of these
3. On what amount of coin volition the Simple Interest endure Rs. 2160 inwards half-dozen years at 8% per annum ? 
1. Rs. 4000
2. Rs. 4500
3. Rs. 4800
4. Rs. 5000
5. None of these
4. On what amount of coin volition the Simple Interest endure Rs. 3600 inwards 2 years at 12% per annum ?
1. Rs. 15000
2. Rs. 14500
3. Rs. 16000
4. Rs. 20000
5. None of these

Model 3 : 

1. A human being invested Rs. 20,000 at 10% p.a., Rs. 15,000 at 12% p.a., in addition to or thus coin at 15% p.a., If the full annual involvement received is Rs. 5,600, detect the coin invested past times him at 15% p.a.
1. Rs. 10000
2. Rs. 12000
3. Rs. 12500
4. Rs. 18000
5. None of these

Solution :

Here, the full Interest he received is Rs. 56,00.

So,  detect the full involvement in addition to equate it amongst 56,00

So, the full involvement = Σ [ (PTR)/100 ]    [ hither Sigma symbol ( Σ ) represents the Total]

                = 200x10+150x12+ (P/100)x15 = 5600

                   3800+ (3P/20) = 5600

               = 3P/20  =  1800 => P = 12000/-

Practice Problems on Model 3 :

2. A human being invested Rs. 10,000 at 10% p.a., Rs. 12000 at 12% p.a. in addition to or thus coin at 15% p.a. If the full annual involvement received is Rs. 4,690, detect the coin invested past times him at 15% p.a.
1. Rs. 10000
2. Rs. 12000
3. Rs. 12500
4. Rs. 18000
5. None of these
3. A human being invested Rs. 20,000 at 10% p.a., Rs. 15,000 at 18% p.a. in addition to or thus coin at 15% p.a. If the full biannual involvement received is Rs. 14,800 detect the coin invested past times him at 15% p.a. [Note : Here biannual agency Two Years]
1. Rs. 10000
2. Rs. 12000
3. Rs. 12500
4. Rs. 18000
5. None of these
4. A human being invested Rs. 30,000 at 10% p.a.., Rs. 25,000 at 12% p.a., in addition to or thus coin at 8% p.a., If the full involvement received inwards 3 years is Rs. 21,000 detect the coin invested past times him at 15% p.a. 
1. Rs. 10000
2. Rs. 12000
3. Rs. 12500
4. Rs. 18000
5. None of these

Model 4 :

1. On a amount of coin the charge per unit of measurement of involvement is 5% p.a. for the kickoff 3 years, 6% p.a. for the adjacent four years in addition to 8% p.a for the adjacent years beyond the kickoff vii years. If the involvement obtained inwards 12 years is Rs. 3,950, detect the amount (or) regulation [both are same]. 
1. Rs. 5000
2. Rs. 6000
3. Rs. 7200
4. Rs. 8000
5. None of these

Solution :

(5% x 3) + (6% x 4) + (8% x 5)

15% + 24% + 40% = 79%

=> 79/100P = 3950

=> P = 395000 / 79 = 5000

Practice Problems on Model 4

2. On a amount of coin the charge per unit of measurement of involvement is 4% p.a. for the kickoff 3 years, 5% p.a for the adjacent 3 years in addition to 8% p.a for the adjacent years beyond the kickoff vii years. If the involvement obtained inwards nine years is Rs. 2,640, detect the sum. 
1. Rs. 5000
2. Rs. 6000
3. Rs. 7200
4. Rs. 8000
5. None of these
3. On a amount of coin the charge per unit of measurement of involvement is 6% p.a. for the kickoff 2 years, 7% p.a .for the adjacent 3 years in addition to 8% p.a for the adjacent years beyond the kickoff 5 years. If the involvement obtained inwards 8 years is Rs. 4,560, detect the sum. 
1. Rs. 5000
2. Rs. 6000
3. Rs. 7200
4. Rs. 8000
5. None of these
4. On a amount of coin the charge per unit of measurement of involvement is 5% p.a. for the kickoff four years, 6% p.a. for the adjacent 5 years, in addition to 8% p.a. for the adjacent years beyond the kickoff nine years. If the involvement obtained inwards 12 years is Rs. 5328, detect the sum.
1. Rs. 5000
2. Rs. 6000
3. Rs. 7200
4. Rs. 8000
5. None of these

Model 5 :

1. A amount was set at S.I at a for certain charge per unit of measurement for 5 years. Had it been set at 3% p.a. higher rate, it would direct hold fetched Rs. 900 more. Find the sum. 
1. Rs. 4000
2. Rs. 4500
3. Rs. 5000
4. Rs. 5400
5. None of these

Solution :

Don't endure confused. Here the Sum / Principle remains same. Call it every bit P.

They are saying, if it set for or thus additional rate, it would direct hold fetched or thus Additional interest. We already know the formula for finding P.

Find out,

P  = 100I / TR                  [Here I is Additional Interest in addition to R is additional Rate]

= (100x900) / (5x3) = 6000

Practice Problems on Model 5

2. A amount was set at S.I at a for certain charge per unit of measurement for 5 years. Had it been set at 4% p.a. higher rate, it would direct hold fetched Rs. 900 more. Find the sum. 
1. Rs. 4000
2. Rs. 4500
3. Rs. 5000
4. Rs. 5400
5. None of these
3. A amount was set at S. I at a for certain charge per unit of measurement for four years. Had it been set at 3% p.a. higher rate, it would direct hold fetched Rs. 900 more. Find the sum. 
1. Rs. 4000
2. Rs. 4500
3. Rs. 5000
4. Rs. 54000
5. None of these
4. A amount was set at S.I. at a for certain charge per unit of measurement for 3 years. Had it been set at 6% p.a. higher rate, it would direct hold fetched Rs. 900 more. Find the sum. 
1. Rs. 4000
2. Rs. 4500
3. Rs. 500
4. Rs. 5400
5. None of these

Model 6 : 

1. On a for certain amount of coin the Simple Interest inwards 2 years at 10% p.a. is Rs. 125. What would endure the Simple Interest if the charge per unit of measurement of involvement volition endure 12% p.a. inwards iii years ?
1. Rs. 216
2. Rs. 225
3. Rs. 240
4. Rs. 250
5. None of these

Solution :

Here the Principle is same for both the cases. That means  p = P    

=> 100i / tr  =  100I / TR
=  125 / (2 x 10)  =  I / (3 x 12)
= >  I = 225 

Practice Problems on Model half-dozen :

2. On a for certain amount of coin the uncomplicated involvement inwards 3 years at 10% p.a. is Rs. 360. What would endure the uncomplicated involvement if the charge per unit of measurement of involvement volition endure 12% p.a. inwards v years ?
1. Rs. 600
2. Rs. 640
3. Rs. 720
4. Rs. 9000
5. None of these
3. On a for certain amount of coin the uncomplicated involvement inwards 2 years at 12% p.a. is Rs. 120. What would endure the uncomplicated involvement if the charge per unit of measurement of involvement volition endure 15% p.a. inwards iii years ?
1. Rs. 216
2. Rs. 225
3. Rs. 240
4. Rs. 250
5. None of these
4. On a for certain amount of coin the uncomplicated involvement inwards four years at 10% p.a. is Rs. 480. What would endure the additional uncomplicated involvement if the charge per unit of measurement of involvement volition endure 12% p.a. inwards v years ?
1. Rs. 216
2. Rs. 225
3. Rs. 240
4. Rs. 576
5. None of these

Model 7 :

1. The uncomplicated involvement on Rs. 6400 at 12 1/2% per annum is Rs. 2000. Find the menstruation ?
1. 2 years
2. 2 years 3 months
3. 2 years half-dozen months
4. 3 years 2 months
5. None of these

Solution :

T = 100I / PR   =  (100 X 2000 X 2) / (6400 X 25)  =  2 1/2 years

Practice Problems on Model 7

2. The uncomplicated involvement on Rs. 6000 at 12% per annum is Rs. 2280. Find the menstruation ?
1. 2 years
2. 2 years 3 months
3. 2 years half-dozen months
4. 3 years 2 months
5. None of these
3. The uncomplicated involvement on Rs. 8400 at 15% per annum is Rs. 2520. Find the menstruation ?
1. 2 years
2. 2 years 3 months
3. 2 years half-dozen months
4. 3 years 2 months
5. None of these
4. The uncomplicated involvement on Rs. 5400 at 16% per annum is Rs. 1944. Find the menstruation ?
1. 2 years
2. 2 years 3 months
3. 2 years half-dozen months
4. 3 years 2 months
5. None of these

Model 8 :

1. The uncomplicated involvement on Rs. 6000 inwards 3 years in addition to four months is Rs. 3000. Find the charge per unit of measurement percentage per annum. 
1. 15
2. 17.5
3. 18
4. 20
5. None of these

Solution :

Here T = 3 4/12 = 3 1/3  = 10/3 years 

We direct hold to detect out the charge per unit of measurement R

I = PTR / 100 =>  R = 100I / PT

=>  (100 X 3000 X 3) / (6000 X ten ) = 15

Practice Problems on Model 8 :

2. The uncomplicated involvement on Rs. 6000 inwards 3 years in addition to 3 months is Rs. 3900. Find the charge per unit of measurement percentage per annum. 
1. 15
2. 17.5
3. 18
4. 20
5. None of these
3. The uncomplicated involvement on Rs. 6000 inwards four years in addition to four months is SR. 4680. Find the charge per unit of measurement percentage per annum. 
1. 15
2. 17.5
3. 18
4. 20
5. None of these
4. The uncomplicated involvement on Rs. 64000 inwards four years is RS. 4480. Find the charge per unit of measurement percentage per annum. 
1. 15
2. 17.5
3. 18
4. 20
5. None of these

Model 9 : 

1. Arjun took a loan of Rs. 4000 at S.I. After 2 years he cleared the loan past times paying Rs. 5600. Find the charge per unit of measurement % p.a. 
1. 12
2. 12.5
3. 15
4. 18
5. None of these

Solution :

Here Arjun took Rs. 4000 in addition to Payed 5600. So the Interest volition endure 5600-4000 = 1600

So, R = 100I / PT
=  (100 X 1600) / (400 X 2)
=  20

Practice Problems on Model 9

2. Arjun took a loan of Rs. 4000 at S.I. After 3 years he cleared the loan past times paying Rs. 5440. Find the charge per unit of measurement % p.a. 
1. 12
2. 12.5
3. 15
4. 18
5. None of these
3. Arjun took a loan of Rs. 4000 at S.I. After 2 years he cleared the loan past times paying Rs. 5000. Find the charge per unit of measurement % p.a. 
1. 12
2. 12.5
3. 15
4. 18
5. None of these
4. Arjun took a loan of Rs. 4000 at S.I. After four years he cleared the loan past times paying Rs. 6880. Find the charge per unit of measurement % p.a. 
1. 12
2. 12.5
3. 15
4. 18
5. None of these

Model 10 :

1. A lent Rs. 25000 to B for four years in addition to Rs. 40000 to C for 3 1/2 twelvemonth in addition to got Rs. 24000 uncomplicated involvement from both the cases. Find the charge per unit of measurement p.c.p.a ?
1. 9
2. 10
3. 12.5
4. 15
5. None of these

Solution :

Given that Σ [ (PTR)/100 ]   =  Rs. 24000

Σ [ (PTR)/100 ]   =  250 x4R + 400x(7/2) R =  2400R

=> R = 10

Practice Problems on Model 10

2. A lent Rs. 25000 to B for four years in addition to Rs. 40000 to C for 3 years in addition to got Rs. 27500 uncomplicated involvement from both the cases. Find the charge per unit of measurement p.c.p.a ?
1. 9
2. 10
3. 12.5
4. 15
5. None of these
3. A lent Rs. 25000 to B for 5 years in addition to Rs. 40000 to C for four years in addition to got Rs. 42750 uncomplicated involvement from both the cases. Find the charge per unit of measurement p.c.p.a 
1. 9
2. 10
3. 12.5
4. 15
5. None of these
4. A lent Rs. 30000 to B for four years in addition to Rs. 50000 to C for 3 years in addition to got Rs. 24300 uncomplicated involvement from both the cases. Find the charge per unit of measurement p.c.p.a 
1. 9
2. 10
3. 12.5
4. 15
5. None of these

Model 11 :

1. Ravi took a loan of Rs. 12000 at 12% p.a. Find the amount to endure paid past times him afterwards 3 years at uncomplicated involvement ?
1. Rs. 4320
2. Rs. 5600
3. Rs. 17600
4. Rs. 16320
5. None of these

Here they asked amount. So, calculate the Interest in addition to add together it to Principle. 

I = PTR/100 = 120 x 3 x 12 =4320

Influenza A virus subtype H5N1 = 4320 + 12000 = 16320

Practice Problems on Model 11

2. Ram took a loan of Rs. 12600 at 12% p.a. Find the amount to endure paid past times him afterwards 8 years at uncomplicated interest. 
1. Rs. 26596
2. Rs. 25696
3. Rs. 24696
4. Rs. 26496
5. None of these
3. Teja took a loan of Rs. 22000 at 15% p.a. Find the amount to endure paid past times him afterwards 2 years at uncomplicated interest. 
1. Rs. 26600
2. Rs. 28800
3. Rs. 26800
4. Rs. 28600
5. None of these
4. Shiv took a loan of Rs. 35800 at 8% p.a. Find the amount to endure paid past times him afterwards 5 years at uncomplicated interest. 
1. Rs. 51020
2. Rs. 50120
3. Rs. 52010
4. Rs. 50210
5. None of these

Model 12 :

1. What amount volition amount to Rs. 1920 inwards four years at 15% per annum uncomplicated involvement ?
1. Rs. 1200
2. Rs. 1250
3. Rs. 1320
4. Rs. 1400
5. None of these

Solution :

Interest = T x R = four x 15% = 60%

P = 100A / (100+TR) = (100 x 1920) / 160 = 1200

Practice Problems on Model 12

2. What amount volition amount to Rs. 1750 inwards 2 years at 20% per annum uncomplicated involvement ?
1. Rs. 1200
2. Rs. 1250
3. Rs. 1320
4. Rs. 1400
5. None of these
3. What amount volition amount to Rs. 11600 inwards 3 years at 15% per annum uncomplicated involvement ?
1. Rs. 8000
2. Rs. 8800
3. Rs. 9600
4. Rs. 10000
5. None of these
4. What amount volition amount to Rs. 16200 inwards 5 years at 7% per annum uncomplicated involvement ?
1. Rs. 9600
2. Rs. 10000
3. Rs. 11750
4. Rs. 12000
5. None of these

Model 13 :

1. In how many years volition a amount of coin come about away double at 12 1/2% per annum uncomplicated involvement ?
1. 6
2. 8
3. 10
4. 12
5. None of these

Solution :

TR =  100x - 100

T x 12 1/2 = 100 x 2 - 100

T x 25/2 = 100 = > T = 8

Practice Problems on Model 13

2. In how many years volition a amount of coin come about away double at 8% per annum uncomplicated involvement ?
1. 6
2. 8
3. 10
4. 12
5. None of these
3. In how many years volition a amount of coin come about away thrice at 12 1/2% per annum uncomplicated involvement ?
1. 6
2. 8
3. 10
4. 12
5. None of these
4. In how many years volition a amount of coin come about away 2 1/2 times at 12 1/2% per annum uncomplicated involvement ?
1. 6
2. 8
3. 10
4. 12
5. None of these

Model 14 :

1. A amount of coin becomes double itself inwards 5 1/2 years at uncomplicated interest. In how many years volition it becomes thrice ?
1. 15
2. 10
3. 18
4. 6
5. None of these

Solution :

Rate is same for both the cases. So,

tr / TR = 100 (x-1) / 100 (X-1)

=> t/T = x-1 / X-1

here, 

x = 2, t = 5 1/2

X = 3, nosotros direct hold to detect out T 

=> (5 1/2) / T = 1/2 = >  T = 11

Practice Problems on Model 14

2. A amount of coin becomes thrice itself inwards ten years at uncomplicated interest. In how many years volition it come about away four times ?
1. 15
2. 10
3. 18
4. 6
5. None of these
3. A amount of coin becomes 2 1/2 fourth dimension sitself inwards 12 years at uncomplicated interest. In how many years volition it come about away 3 1/4 times ?
1. 15
2. 10
3. 18
4. 6
5. None of these
4. A amount of coin becomes 1 3/4 times itself inwards 5 years at uncomplicated interest. In how many years volition it come about away 5 1/2 times ?
1. 15
2. 20
3. 18
4. 25
5. None of these

Model 15 :

2. A human being received Rs. 240 every bit S.I. on Rs. 800 for half-dozen years. If he expects Rs. 300 every bit S.I on Rs. 1200, for how many years should he proceed the deposit ?
1. 4
2. 4.5
3. 5
4. 7.5
5. None of these

Solution : 

r = R

100i / pt = 100I / PT

240 / (800x6) = 300 / 1200T

T = 5

Practice Problems on Model 15

1. A human being received Rs. 360 every bit S.I. on Rs. 1200 for half-dozen yars. If he expects Rs. 12000 every bit S. I on Rs. 4000, for how many years should he proceed the deposit ?
1. 4
2. 4.5
3. 5
4. 7.5
5. None of these
2. A human being received Rs. 720 every bit S.I on Rs. 4800 for 2 years. If he expects Rs. 1560 every bit S. I on Rs. 5200, for how many years should he proceed the deposit ?
1. 4
2. 4.5
3. 5
4. 7.5
5. None of these
3. A human being received Rs. 960 as  S. I on Rs. 18000 for 3 years. If he expects Rs. 1440 every bit S. I on Rs. 10800 for how many years should he proceed the deposit ?
1. 4
2. 4.5
3. 5
4. 135/16
5. None of these

Model 16 :

1. The S. I on a amount of coin is 9/16 of the principal in addition to the charge per unit of measurement p.c.p.a is same every bit the publish of years. Find the period.
1. 4
2. 4.5
3. 5
4. 7.5
5. None of these

Solution :

I = 9/16 x P

=> I/P = 9/16

* If at that spot is whatsoever relation betwixt Time & charge per unit of measurement    TR = 100 I/P

Here fourth dimension in addition to charge per unit of measurement are same

=> T x T = 100 x 9/16

=> T = ten x 3/4 = vii 1/2 Years

Practice Problems on Model 16

2. The S.I on a amount of coin is 16/25 of the principal in addition to the charge per unit of measurement p.c.p.a is same every bit the publish of years. Find the period.
1. 4
2. 4.5
3. 5
4. 7.5
5. None of these
3. The S.I on a amount of coin is 8/25 of the principal in addition to the charge per unit of measurement p.c.p.a is twice every bit the publish of years. Find the period. 
1. 4
2. 4.5
3. 5
4. 7.5
5. None of these
4. The S.I on a amount of coin is 9/10 of the principal in addition to the charge per unit of measurement p.c.p.a is ii in addition to a one-half times every bit the publish of years. Find the rate.
1. 6
2. 9
3. 12
4. 15
5. None of these

Model 17 :

1. A for certain amount amounts to Rs. 3120 inwards 3 years in addition to to Rs. 4080 inwards vii years. Find the charge per unit of measurement p.c.p.a
1. 9
2. 10
3. 12
4. 15
5. None of these

Solution :

Interest / 1 twelvemonth = Difference inwards Amount / Difference inwards Time 

= 960/4 = 240

P = 3120 - 3 x 240  = 2400

R = 100 I / PT = 100x240 / 2400x1 = 10

Practice Problems on Model 17

1. A for certain amount amounts to Rs. 6800 inwards 3 years in addition to to Rs. 9800 inwards 8 years. Find the charge per unit of measurement p.c.p.a. 
1. 9
2. 10
3. 12
4. 15
5. None of these
2. A for certain amount amounts to Rs. 4720 in  2 years in addition to to Rs. 6880 inwards 8 years. Find the charge per unit of measurement p.c.p.a. 
1. 9
2. 10
3. 12
4. 15
5. None of these
3. A for certain amount amounts to Rs. 9600 inwards four years in addition to to Rs. 12300 inwards vii years. Find the charge per unit of measurement p.c.p.a. 
1. 9
2. 10
3. 12
4. 15
5. None of these

Work amongst these models in addition to solve the given practise problems. Share your solutions inwards the comments department below. Will post service shortcuts in addition to Practice problems on Compound Interest tomorrow. All the Best :)

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