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

A.  Rs. 3100
B.  Rs. 6240
C.  Rs. 6500
D.  Rs. 9600
Answer: B

Explanation: 

To obtain Rs.10, investment = Rs. 96.
To obtain Rs. 650, investment = Rs.(96/10 x 650)
                                                  = Rs. 6240.