Quantitative Aptitude • Simple & Compound InterestHard
On a certain sum, the simple interest for 2 years is ₹1,450 and the compound interest for 2 years at the same rate is ₹1,479. What is the rate of interest?
A. 8%
B. 4%✓ Correct Answer
C. 9%
D. 2%
💡 Solution & Explanation
Simple interest for one year = ₹1,450 ÷ 2 = ₹725. Compound interest is higher only because, in year 2, interest is also earned on year 1's interest: ₹1,479 − ₹1,450 = ₹29. That extra is the year-2 interest on ₹725, so the rate = 29 ÷ 725 × 100 = 4%. The principal is then ₹725 × 100 ÷ 4 = ₹18,125.
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