A sum at simple interest amounts to ₹7,200 in 2 years and to ₹8,400 in 4 years. What is the sum?

Correct answer: A. ₹6,000

Interest for the extra 2 years = 8,400 − 7,200 = ₹1,200, i.e. ₹600 a year. Interest for 2 years = ₹1,200, so the sum = 7,200 − 1,200 = ₹6,000.

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Answer and explanation

The correct answer is A. ₹6,000

Interest for the extra 2 years = 8,400 − 7,200 = ₹1,200, i.e. ₹600 a year. Interest for 2 years = ₹1,200, so the sum = 7,200 − 1,200 = ₹6,000.