Question
A sum of money amounts to Rs 9,200 in 3 years at 5%
simple interest per annum. Find the interest earned .Solution
Let principal = P SI = (P × R × T)/100 = P × 5 × 3 / 100 = (15P/100) = 3P/20 Amount A = P + SI = P + 3P/20 = 23P/20 Given A = 9,200: 23P/20 = 9,200 ⇒ 23P = 9,200 × 20 = 1,84,000 ⇒ P = 1,84,000 / 23 = 8,000 SI = 9,200 − 8,000 = 1,200 Answer: Interest = Rs 1,200
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