How much time will it take for an amount of Rs. 450 to yield Rs. 81 as interest at 4.5% per annum of simple interest?

A. 3.5 years

B. 4 years

C. 4.5 years

D. 5 years

Answer: Option B

Solution(By Examveda Team)

$$\eqalign{ & {\text{P}} = {\text{Rs}}{\text{.}}\,{\text{450}} \cr & {\text{S}}{\text{.I}}{\text{.}} = {\text{Rs}}{\text{. 81}} \cr & {\text{R}} = {\text{4}}{\text{.5}}\% \cr & {\text{Time}} \cr & = \left( {\frac{{100 \times 81}}{{450 \times 4.5}}} \right){\text{years}} \cr & = 4\,{\text{years}}{\text{}} \cr} $$