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Rs. 9800 are invested partly in 9% stock at 75 and 10% stock at 80 to have equal amount of incomes. The investment in 9% stock is

A. Rs. 4800

B. Rs. 5000

C. Rs. 5400

D. Rs. 5600

Correct Answer :

B. Rs. 5000



Let the investment in 9% stock be Rs. x.
Then, investment in 10% stock = Rs. (9800 - x).
975 × x = 1080 × (9800 - x) 
3x25 = 9800 - x8
24x = 9800 x 25 - 25x
49x = 9800 x 25
x = 5000.