Rs. 2780 are invested partly in 4% stock at 75 and 5% stock at 80 to have equal amount of incomes. The investment in 5% stock is: Choose the correct answer:
A) 1200  B) 1500  C) 1280  D) 1300  E) 1600
Investment Rs 2780   stock - 4% 75 5% at 80%   req 5% stock is -- 1280   ANSWER 1280
<result>C</result>
Rs. 2780 are invested partly in 4% stock at 75 and 5% stock at 80 to have equal amount of incomes. The investment in 5% stock is: