Simple interest earned on an amount of Rs. 1000 at rate of R% per annum after 4 years is Rs. 280. Find the simple interest earned on an amount of Rs. 1500 at rate of (R + 4)% per annum after 3 years
According to question, 280 = 1000 × R% × 4 R = 7 Therefore, required interest = 1500 × (7 + 4)% × 3 = Rs. 495
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