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    Question

    A man borrowed Rs 200 and promised to pay back in 11

    equal instalments of Rs 20 each. Find the rate of simple interest per annum?
    A 21(9/11)% Correct Answer Incorrect Answer
    B 16(7/11)% Correct Answer Incorrect Answer
    C 19(5/11)% Correct Answer Incorrect Answer
    D 11(1/11)% Correct Answer Incorrect Answer

    Solution

    First month = Rs 200 Second month = Rs 180 Third month =Rs 160 Sum = n/2 {2a + ( n тАУ 1 )d] a = 200┬а┬а d = - 20 = (11/2) [2 x 200 + ( 11 тАУ 1 ) (-20)] ┬а= (11/2) [400 тАУ 20] ┬а= (11/2) x 200 = 1100 ┬а P = (200 x 11)/2┬а = 1,100 ┬а(P x R x T)/100 = S.I ┬а(1100 x R x 1)/(100 x 12) = 20 R = (12 x 20)/11 = 21(9/11) %

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