Question

If the simple interest on a certain sum of money for 2 years be one fifth of the sum ,then find the rate of interest per annum

Answer 1

The answer is 10 percent.
I*100\P*T
20x/2x
x and x cancel
20\2=10%

Answer 2

Answer:

10%

Step-by-step explanation:

Let the principal be x

We are given that he simple interest on a certain sum of money for 2 years be one fifth of the sum

So, Simple interest = $\frac{1}{5}x$

Time = 2 years

Let R be the rate of interest in percent.

Formula : $S.I. = \frac{P \times R \times T}{100}$

$\frac{1}{5}x= \frac{x \times R \times 2}{100}$

$10x= x \times R$

$10=R$

Thus the rate of interest per annum is 10% .