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    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.
    A Rs. 396 Correct Answer Incorrect Answer
    B Rs. 326 Correct Answer Incorrect Answer
    C Rs. 336 Correct Answer Incorrect Answer
    D Rs. 356 Correct Answer Incorrect Answer

    Solution

    Let the sum invested be Rs. тАШPтАЩ Therefore, interest earned in 5 years = 1.22P тАУ P = Rs. 0.22P ATQ; 0.22P = (P ├Ч r ├Ч 5) ├╖ 100 Or, r = 22 ├╖ 5 Or, r = 4.4 So, required interest earned = (3000 ├Ч 4.4 ├Ч 3) ├╖ 100 = Rs. 396

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