Lakshmi invested some money in 15% stock at 200.If Latha wants to invest in an equally good 30% stock ,he must purchase a stock worth of :  Choose the correct choice from the following choices:
A) Rs. 300	B) Rs. 200	C) Rs. 450	D) Rs. 500	E) Rs. 400
Solution   For an income of Rs. 15, investment = Rs. 200   For an income of Rs. 30, investment = Rs.(200/15x30) = Rs. 400   Answer Rs. 400
<result>E</result>
Lakshmi invested some money in 15% stock at 200.If Latha wants to invest in an equally good 30% stock ,he must purchase a stock worth of :