In how much time, will a sum of money become double of itself at 10% per annum simple interest?a.18 YEARSb.24 YEARSc.20 YEARSd.10 YEARS

The formula for simple interest is I = PRT, where I is the interest, P is the principal amount (the initial amount of money), R is the rate of interest per year, and T is the time in years.

In this case, we want the sum of money to double. This means the interest (I) will be equal to the principal (P). So, we can set up the equation as follows:

P = P * 10/100 * T

Solving for T (time), we get:

T = P / (P * 10/100)

Simplifying, we find:

T = 100 / 10

T = 10 years

So, the correct answer is d. 10 YEARS.