The simple interest on a sum of money at 8% per annum for 6 years is half the sum. The sum is:

Answer: Option D

$$\begin{array}{rl}& \text{Let sum}=x\text{.}\\ & \text{Then,}\\ & \text{S}\text{.I}\text{.}=\frac{x}{2}\\ & \therefore \frac{x}{2}=\frac{x\times 8\times 6}{100}\end{array}$$
Clearly, data is inadequate.