Question

    The certain sum amounts to Rs11313.5 in 2(1/2) years at

    12% p.a., interest compounded 10 months. The sum (in Rs) is:
    A 30 Correct Answer Incorrect Answer
    B 60 Correct Answer Incorrect Answer
    C 55 Correct Answer Incorrect Answer
    D 45 Correct Answer Incorrect Answer

    Solution

    The average of 10 observations = 50 Total of 10 observations = 50×10 = 500 Misread number = 42, right number = 142 By mistake difference in number = 142-42= 100 Now a correct total of 10 observations = 500+100= 600 Average = 600/10 = 60

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