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Tanya and Tashu invested in a scheme offering simple interest at the rates of 12% and 15% per annum for 4 years and 3 years respectively. If Tanya's investment is ₹300 less than Tashu's, find the amount invested by Tashu, given that the interest received by both is equal.

1. ₹4200
2. ₹4700
3. ₹4400
4. ₹4800

Correct answer: ₹4800

Solution

Using simple interest, Tanya's interest is proportional to 12 × 4 = 48% of her principal, and Tashu's is 15 × 3 = 45% of her principal. Equating the interests and using the ₹300 difference gives Tashu's investment as ₹4800.

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