In order to obtain an income of Rs. 650 from 10% stock at Rs. 96, one must make an investment of:

Answer: Option B

To obtain Rs. 10, investment = Rs. 96.
To obtain Rs. 650,
$$\begin{array}{rl}& \text{investment}=Rs.\left(\frac{96}{10}\times 650\right)\\ & =Rs.6240\end{array}$$