Priya invested some money in 5% stock at 200.If David wants to invest in an equally good 20% stock ,he must purchase a stock worth of :  Choose the correct choice:  A) Rs. 400  B) Rs. 600  C) Rs. 800  D) Rs. 600  E) Rs. 500
Solution   For an income of Rs. 5, investment = Rs. 200   For an income of Rs. 20, investment = Rs.(200/5x20) = Rs. 800   Answer Rs. 800
<result>C</result>
Priya invested some money in 5% stock at 200.If David wants to invest in an equally good 20% stock ,he must purchase a stock worth of :