Question
A man invested certain sum at simple interest of r% p.a.
such that it amounts to 150% of itself in 5 years. Find the interest earned when Rs. 2200 is invested at simple interest of r% p.a. for 3 years.Solution
Let the sum invested be Rs. ‘P’ Therefore, interest earned in 5 years = 1.5P – P = Rs. 0.5P ATQ; 0.5P = (P × r × 5) ÷ 100 Or, r = 50 ÷ 5 Or, r = 10 So, required interest earned = (2200 × 10 × 3) ÷ 100 = Rs. 660
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