To earn Rs. 77, investment = Rs. 1100
To earn Rs. 11/2, investment = (1100 / 77) x (11/2) = Rs. 784/7
By investing Rs 96, income derived = Rs. 9/2
By investing Rs. 100, income derived = Rs. (9 x 100) / (2 x 96) = Rs.4.69
Interest obtained =4.69%
For an income of Rs. 4, stock needed = Rs. 100
For an income of Rs. 500, stock needed = Rs. (100 / 4) x 500 = Rs. 12500
For an income of Rs. 5, investment = Rs. 100
For an income of Rs. 4, investment = Rs. (100/5) x 4 = Rs. 80
For an income of Rs. 6, investment = Rs. 96.
For an income of Rs. 100, investment = Rs. (96 / 6) x 100 = Rs. 1600
Cash realized = Rs. (1061/4 - 1/4) = Rs. 106
Income on Rs. 100 stock = Rs. 51/2 = Rs. 5.50
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