RRB NTPC - Simple Interest

1.

The borrow taken by a man, for every 6 years it will be 3 times, then how much time it will be taken For 8 times: 

   A.) 20 years
   B.) 21 years
   C.) 22 years
   D.) 25 years

Answer: Option 'B'

(R)2% ------> 6 years 
7/2% × 6 = 21 years 
Answer = 21 years 

2.

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/-

3.

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% 

4.

Find simple interest on Rs.5000/- at 12% p.a. for 73days? 

   A.) Rs.220/-
   B.) Rs.120/-
   C.) Rs.210/-
   D.) None of these

Answer: Option 'B'

73 days = 73/365 = T 
P = Rs.5000 
R = 12% 
I = (5000*73/365*12)/100 = 120/- 
I = Rs.120/- 

5.

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/- 

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