The compound interest on Rs. 5000 for 3 years at 10% p.a. will amount to = ?

Answer: Option B

$$\begin{array}{rl}& \text{Principal = Rs. 5000}\\ & \text{Time = 3 years}\\ & \text{Rate = 10}\%\text{ = }\frac{1}{10}\\ & \text{Principal}\text{Amount}\\ & \text{10}\text{11}\\ & \text{10}\text{11}\\ & \text{10}\text{11}\\ & \underset{331\text{ units}}{\underbrace{\overline{1000\text{1331}}}}\\ & \Rightarrow 1000\text{ units = Rs 5000}\\ & \Rightarrow 1\text{ units = Rs 5}\\ & \Rightarrow 331\text{ units = 331}\times \text{5}\\ & \text{ = Rs. 1655}\end{array}$$