Question
A man invested certain sum at simple interest of r% p.a.
such that it amounts to 122% of itself in 5 years. Find the interest earned when Rs. 3000 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 = 1.22P – P = Rs. 0.22P ATQ; 0.22P = (P × r × 5) ÷ 100 Or, r = 22 ÷ 5 Or, r = 4.4 So, required interest earned = (3000 × 4.4 × 3) ÷ 100 = Rs. 396
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