A invested some money in 10% stock at 96. If B wants to invest in an equally good 12% stock, he must purchase a stock worth of__________?

A. Rs. 80
B. Rs. 115.20
C. Rs. 120
D. Rs. 125.40

For an income of Rs. 10, investment = Rs. 96.
For an income of Rs. 12, investment = Rs ( 96/10 X 12 )
= Rs. 115.20