Question

If the simple interest on a certain sum of money is 4/25 of the sum and the rate percent equals the number years, then the rate of interest per annum is:

Answer 1

Answer: The rate of interest per annum is 40%.

We arrive at the answer by following these steps:

The formula for Simple Interest (SI) is:

$SI = P*N*R$ where  

P = Principal

N = No. of years

R = Rate of interest

From the question we have:

$SI = \frac{4}{25}P$ and

N=R Substituting these values in the SI formula we get:

$\frac{4}{25}P = P*R*R$

$0.16P = P*R^2$

$0.16 = R^2$

R = 0.40

Since N=R, N = 0.4 years or 146 days.

Answer 2

Explanation:

acid will be 4%

the above answer is wrong