Question

At what rate per cent annum simple interest will a sum treble itself in 15 years?​

Answer 1

Step-by-step explanation:

Let Rsx be the sum, then according to question, the amount will be Rs3x. Then simple interest will be,

S.I.=Amount−Principle

=3x−x

=2x

The time is given as 16 years.

S.I.=

100/

P×R×T

2x=

100/

x×R×16

R=

x×16/

2x×100

R=12.5%