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P invests Rs. (X - 5000) at a compound interest rate of R% per annum for 2 years, while Q invests Rs. (X + 2000) at 2R% per annum for the same period. The ratio of their investments is 5:7. Find the difference in the compound interest earned by P and Q after 2 years.

1. 2400
2. 12400
3. 5600
4. Can't be determined

Correct answer: Can't be determined

Solution

The ratio of investments can help determine X, but the actual compound interest depends on the rate R. Since R is not given, the difference in compound interest cannot be uniquely calculated. Therefore, the answer cannot be determined.

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