In a certain time, the ratio of a certain principal and interest obtained from it are in the ratio 10 : 3 at 10% interest per annum. The number of years for which the money was invested is = ?

A. 1 year

B. 3 year

C. 5 year

D. 7 year

Answer: Option B

Solution(By Examveda Team)

According to the question,

Principal	Interest
10	3

$$\eqalign{ & {\text{Rate }}\% {\text{ = 10}}\% \cr & {\text{Time = }}\frac{3}{{10}} \times \frac{{100}}{{10}} \cr & \,\,\,\,\,\,\,\,\,\,\,\,\, = 3\,{\text{years}} \cr} $$