RRB NTPC - Simple Interest

1.

A person took some amount with some interest for 1 years, but increase the interest for 2%, he paid Rs.60/- extra, then how much amount he took? 

   A.) Rs.3000/-
   B.) Rs.4000/-
   C.) Rs.2900/-
   D.) Rs.2000/-

Answer: Option 'A'

Only 1 year = 60/1 = 60 
Rate of Interest = 2% 
100/2% × 60 = Rs.3000/- 
P = Rs.3000/- 

2.

At what rate of percent per annum will a sum of money double in 8 years? 

   A.) 13 ¼%
   B.) 12 ½%
   C.) 11 ½%
   D.) None of these

Answer: Option 'B'

Let principal be Rs P. Then, S.I = Rs P and Time = 8 years> 
Rate = (100 × S.I)/(P × T) = (100 × P/P × 8)% p.a 
= 25/2 % p.a = 12.5% p.a 

3.

A borrow took by a man, for every 5 years it will be doubled, then what is the rate of the interest? 

   A.) 15%
   B.) 20%
   C.) 22%
   D.) 23%

Answer: Option 'B'

P = 1 , I = 1 , T = 5years R = ? 
I = PTR/100 
1 = 1×5×R/100 
R = 20% 

4.

A borrow took by a man, for every 8 years it will be 3 times, then what is the rate of the interest?

   A.) 15%
   B.) 20%
   C.) 25%
   D.) 28%

Answer: Option 'C'

P = 1 , I = 2 , T = 8years R = ? 
I = PTR/100 
2 = 1×8×R/100 
R = 25% 

5.

Find the principle, interest on Rs.1200 at 8% p.a. for 2 years? 

   A.) Rs.6500/-
   B.) Rs.7500/-
   C.) Rs.5500/-
   D.) None of these

Answer: Option 'B'

P = ? 
T = 2 years 
R = 8% 
I = Rs.1200/- 
I = PTR/100 
P = 100I/TR 
P = (100 × 1200)/(2 × 8) 
P = Rs.7500/-

6.

Find the simple interest on Rs.7300/- at 12% p.a. for the period from jan-2007 to 18- april-2007? 

   A.) 247.20
   B.) 247
   C.) 346
   D.) 347

Answer: Option 'A'

247.20

7.

A man took some money for borrowed, for 2 years the total will be Rs.9000/- and 5 years it will be13, Rs.500/-. Then how much amount he borrowed? 

   A.) Rs.4500/-
   B.) Rs.6000/-
   C.) Rs.5000/-
   D.) Rs.5500/-

Answer: Option 'B'

2 years --------> Rs.9000/- 
5 years --------> Rs.13500/- 
~                 ~
-----------------------------  
3 years ----> Rs.4500/- 
1 year -----> Rs.1500/-  
2years × Rs.1500/- = Rs.3300/- 
P = Rs.9000/- - Rs.30000/- = Rs.6000/- 
P = Rs.6000/- 

8.

Find the simple interest 0n Rs.3000/- at 5 1/3% p.a. for 2 ½ years? 

   A.) Rs.150/-
   B.) Rs.200/-
   C.) Rs.400/-
   D.) None of these

Answer: Option 'C'

P = Rs.3000/- 
T = 5/2 years 
R = 16/3% 
I = PTR/100 
I = (3000 × 5/2 × 16/3)/100 
I = 25 × 16 = Rs.400/-

9.

Find simple interest on Rs.5000/- at 12% p.a, for 2 years? 

   A.) Rs.1300/-
   B.) Rs.1400/-
   C.) Rs.1200/-
   D.) Rs.1000/-

Answer: Option 'C'

P = Rs.5000/- 
T = 2 years 
R = 12% 
I = PTR/100 
I = Rs.5000 × 2 × 12/100 = Rs.1200/- 

10.

A man borrowed some amount, after 3 years he paid Rs.10,400/- with 10% interest, then how much Amount he borrowed? 

   A.) Rs.7000/-
   B.) Rs.8000/-
   C.) Rs.9000/-
   D.) Rs.1000/-

Answer: Option 'B'

principal P = ? 
Rate of interest R = 10% 
Time T = 3 years 
Accumulated Amount A = Rs.10400/- 
A = P + I 
A = P + PTR/100 
A = P(1+ TR/100) 
Rs.10400/- = P [1 + 3*10/100] 
Rs.10400/- = P [1/1 + 3/10] 
Rs.10400/- = P [10+3/10] = P[13/10] 
Rs.10400/- = P * 13/10 
==> P = Rs.104000/13 
==> P = Rs.8000/- 

11.

In how many years will sum of Rs.6000/- yield an interest of Rs.1200/- at 8% p.a? 

   A.) 2 1/2 years
   B.) 2 years
   C.) 1 1/2 years
   D.) 3 years

Answer: Option 'A'

P = Rs.6000/- 
T = ? 
R = 8% 
I = Rs.1200/- 
I = PTR/100 
T = (I × 100)/PR 
T = (1200 × 100)/(6000 × 8) 
T = 5/2 ==> 2 1/2 years 

12.

A borrow taken by a man, for every 5 years it will be doubled, then how much time it will be taken 

   A.) 12years
   B.) 15years
   C.) 16years
   D.) 13years

Answer: Option 'B'

(R)1% ------> 5 years 
3/1% × 5 = 15 years 
Answer = 15 years 

13.

A man took some money for borrowed, for 3 years the total will be Rs.4000 and 5 years it will be Rs.5000/-. Then how much amount he borrowed? 

   A.) Rs.500/-
   B.) Rs.1500/-
   C.) Rs.2500/-
   D.) Rs.1000/-

Answer: Option 'C'

3 years --------> Rs.4000/- 
5 years --------> Rs.5000/- 
~                    ~
------------------------------  
2 years ----> Rs.1000/- 
1 year  -----> Rs.500/-  
3 years × Rs.500/- = Rs.1500/- 
P = Rs.4000/- - Rs.1500/- = Rs.2500/- 
P = Rs.2500/-

14.

An employ sell a t.v for Rs.9000/- with 10% simple interest for 5 years on an installment basis. Then How much amount he paid for each installment? 

   A.) Rs.1200/-
   B.) Rs.1500/-
   C.) Rs.1400/-
   D.) Rs.1350/-

Answer: Option 'B'

Instalment = 100 × P/100 × T+T × (T - 1)R/2 
= 100 × 9000/100 × 5+5 × (5-1)10/2 
= 100 × 9000/6000 = Rs.1500/- 

15.

If the simple interest on Rs. 1120 for 2 years is Rs.8000/-, what is the rate of interest percent per annum? 

   A.) 4%
   B.) 7%
   C.) 8%
   D.) 5%

Answer: Option 'B'

I = Rs.1120/- 
T = 2 years 
P = Rs.8000/- 
R = ? 
S.I = (P×T×R/100) 
R = (S.I×100)/(P×T) 
R = (1120×100)/(8000×2) 
R = 56/8 = 7% 

16.

Find simple interest on Rs.6000/- at 7 ½% p.a. for 3years? 

   A.) Rs.1250/-
   B.) Rs.1350/-
   C.) Rs.1200/-
   D.) Rs.1400/-

Answer: Option 'B'

P = Rs.6000/- 
T = 3 years 
R = 15/2% 
I = PTR/100 
I = (6000 × 3 × 15/2)/100 
I = 90 × 15 = Rs.1350/-

17.

A person took some amount with some interest for 2 years, but increase the interest for 1%, he paid Rs.120/- extra, then how much amount he took?

   A.) Rs.5500/-
   B.) Rs.6000/-
   C.) Rs.4000/-
   D.) Rs.7000/-

Answer: Option 'B'

2 years = Rs.120/- 
year = 120/2 
Rate of Interest = 1% 
100/1% × 120/2 = Rs.6000/- 
P = Rs.6000/- 

18.

Find simple interest on Rs.4000/- at 15% p.a. for 9months? 

   A.) Rs.350/-
   B.) Rs.450/-
   C.) Rs.125/-
   D.) Rs.450/-

Answer: Option 'D'

T = 9 months = 9/12 = 3/4 
P = Rs.4000/- , R = 15% 
I =(4000 × 3/4 × 15) /100 = 30 v 15 = Rs.450/- 
I = Rs.450/-

19.

Find simple interest on Rs.6000/- at 10% p.a. for 2years 3 months? 

   A.) Rs.1350/-
   B.) Rs.1250/-
   C.) Rs.2350/-
   D.) None of these

Answer: Option 'A'

2 years 3months = 27/12 = T 
P = Rs.6000/- 
R = 10% 
I = (6000 × 27/12 × 10)/100 = 27 × 50 
I = Rs.1350/-

20.

If the simple interest on Rs.400 for 3 years is Rs.4000/-, what is the rate of interest percent per annum? 

   A.) 4 1/3%
   B.) 3 1/4%
   C.) 3 1/3%
   D.) None of these

Answer: Option 'C'

I = Rs.400/- 
T = 3 years 
P = Rs.4000/- 
R = ? 
S.I = (P×T×R/100) 
R = (S.I×100)/(P×T) 
R = (400×100)/(4000×3) 
R = 10/3 = 3 1/3% 


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