Question

1) at what rate percent of simple interest per annum the interest on a certain sum of 10yrs will be3/5 part of the amount

Answer 1

let rate is r and amount is p
so,
use simple interest formula
SI=p x r x t/100
a/c
SI=3/5p and t=10years
now
3/5p=p x r x10/100
r=6%

Answer 2

Answer:

6%

Step-by-step explanation:

Let the principal be x

We are given that the interest on a certain sum of 10yrs will be3/5 part of the amount

So, Simple interest = $\frac{3}{5}x$

Formula : $SI =\frac{P \times R \times T}{100}$

$\frac{3}{5}x =\frac{x \times R \times 10}{100}$

$\frac{3 \times 100 \times x}{5 \times x \times 10} =R$

$\frac{3 \times 100}{5 \times 10} =R$

$6=R$

Hence the rate of interest is 6%