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    Question

    A student multiplied a number by 4/5 instead of 5/4.

    What is the percentage error in the calculation.
    A 27% Correct Answer Incorrect Answer
    B 64% Correct Answer Incorrect Answer
    C 36% Correct Answer Incorrect Answer
    D 24% Correct Answer Incorrect Answer
    E 35% Correct Answer Incorrect Answer

    Solution

    Let the required number = (LCM of denominator 4 and 5) = 20 According to the question, Wrong answer = 4/5 ┬а├Ч 20 = 16 Correct answer = 5/4 ┬а├Ч 20 = 25 Required percentage of error = ┬а(25-16)/25 ┬а├Ч 100 = 36%

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