Question
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:
Answer: Option B
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Let the investment in 9% stock be Rs. x.
Then, investment in 10% stock = Rs. (9800 - x).
\(\frac{9}{75}\times x = \frac{1}{80}\times\left(9800-x\right).\)
\(\frac{3x}{25} = \frac{9800-x}{8}\)
24x = 9800 x 25 - 25x
49x = 9800 x 25
x = 5000.
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