Question
A certain amount becomes Rs. 7,680 in 6 years and Rs.
9,120 in 9 years on simple interest. Determine the rate of interest per year.Solution
ATQ,
Interest earned in 3 years = 9,120 - 7,680 = Rs. 1,440 Interest earned in 1 year = 1,440 / 3 = Rs. 480 Interest earned in 6 years = 6 × 480 = Rs. 2,880 Principal amount = 7,680 - 2,880 = Rs. 4,800 Rate of interest = (480 / 4800) × 100 = 10% p.a.
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