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    Question

    P invested Rs. 7,000 at a simple

    interest rate of 22% per annum, while Q invested an unknown sum at a compound interest rate of 20% per annum (compounded annually). If the interest earned by P after 2 years was twice the interest earned by Q, find the amount invested by Q.
    A Rs. 2,500 Correct Answer Incorrect Answer
    B Rs. 3,500 Correct Answer Incorrect Answer
    C Rs. 3,550 Correct Answer Incorrect Answer
    D None of these Correct Answer Incorrect Answer

    Solution

    ATQ, Simple interest = (Sum ├Ч rate of interest ├Ч time period) ├╖ 100 Interest earned by P = (7000 ├Ч 22 ├Ч 2) ├╖ 100 = Rs. 3,080 So, interest earned by Q = 3080 ├╖ 2 = Rs. 1,540 Let the sum invested by P be Rs. 'p'. Amount at the end of two years in case of compound interest = Sum ├Ч {1 + (rate/100) }time period ATQ; 1540 + p = p ├Ч {1 + (20/100) }2 Or, 1540 + p = p ├Ч (1.2)2 Or, 1540 + p = 1.44p Or, 1540 = 0.44p So, p = (1540/0.44) = 3500 So, sum invested by Q = Rs. 3,500

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