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A and B entered into a partnership with investments of Rs. 800 and Rs. 1600 respectively. From the 9th month onward, they each decided to invest Rs. 100 more at the start of each month. If the total annual profit is Rs. 7700, find A's share of the profit.

1. Rs. 2650
2. Rs. 3250
3. Rs. 4250
4. Rs. 2350

Correct answer: Rs. 2650

Solution

In partnership problems, profit is divided in the ratio of capital × time. Here, both partners increase their investments from the 9th month onward, so their total capital-month contributions must be calculated month by month. The resulting ratio gives A's share as Rs. 2650.

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