A man sells Rs 5000, 12% stock at 156 and invests the proceeds partly in 8% stock at 90 and 9% stock at 108. He thereby increases his income by Rs 70. How much of the proceeds were invested in each stock?

Ravi invested Rs 913partly in 4% stock at Rs 97 and partly in 5% stock at Rs107. If his income from both is equal: find the amount invested in each stock.

A retired man sells out Rs 7500 of a 10% stock at Rs 105.50 and invests the proceeds in 14% stock at Rs 124.50. What is the change in income is he pays a service charge of 0.5% of the face value on each transaction? (a) Rs 95 (b) Rs 114 (c) Rs 132 (d) None of these

which is better investment: 7.5% stock at 105 or 6.5% stock at 94