In how many years will the simple interest on a sum of money be equal to the principle at rate of $$12\frac{2}{4}\% $$  per annum?

A. 7 years

B. 5 years

C. 8 years

D. 6 years

Answer: Option C

Solution(By Examveda Team)

$$\eqalign{ & 1 = 1 \times \frac{{50}}{{400}} \times t \cr & t = 8{\text{ years}} \cr} $$