If the difference between the compound interest and simple interest on a sum of 5% rate of interest per annum for three years is Rs. 36.60, then the sum is = ?

Answer: Option D

Note : In such type of questions to save your valuable time follow the given below method
Rate % = 5%
Effective Rate of CI for 3 years = 15.7625%
Effective Rate of SI for 3 years = 5 × 3 = 15%

According to the question
\begin{aligned} & \left( {15.7625 - 15} \right)\% \,{\text{of sum}} {\text{ = Rs. 36}}{\text{.60}} \\ & {\text{0}}{\text{.7625% of sum}} {\text{ = Rs. 36}}{\text{.60}} \\ & {\text{Sum = }}\frac{{36.60}}{{0.7625}} \times 100 \\ & \,\,\,\,\,\,\,\,\,\,\,\, = {\text{Rs. }}4800 \\\end{aligned}