A person lent a sum of ₹30,000 on simple interest for 12 years, with an interest rate of 8% per annum for the first 4 years, 10% per annum for the next 3 years, and 15% per annum for last 5 years. How much interest (in ₹) will he earn at the end of 12 years?
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Correct answer: B
Explanation
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