A sum doubles in 10 years at simple interest. Rs. 5,000 is invested at this rate, and after 4 years the rate is raised by 5% per annum. What is the amount at the end of 10 years?
Correct answer C. Rs. 11,500
Explanation
Rate = 100/10 = 10%. SI = 5000 × (10 × 4 + 15 × 6) / 100 = 5000 × 1.3 = 6500. Amount = Rs. 11,500.
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