Question

At what rate percent per annum simple interest will a sum triple 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.= /100P×R×T

2x= /100x×R×16

R= /x×162x×100

R=12.5%

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Answer 2

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%