# 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

(R)2% ------> 6 years
7/2% × 6 = 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

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

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

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/-