Question
A man invested certain sum at simple interest of r% p.a.
such that it amounts to 140% of itself in 2 years. Find the interest earned when Rs. 3200 is invested at simple interest of r% p.a. for 3 years.Solution
Let the sum invested be Rs. ‘P’ Therefore, interest earned in 2 years = 1.4P – P = Rs. 0.4P ATQ; 0.4P = (P × r × 2) ÷ 100 Or, r = 40 ÷ 2 Or, r = 20 So, required interest earned = (3200 × 20 × 3) ÷ 100 = Rs. 1920
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