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    Question

    A student multiplied a number by 2/5 instead of 5/2.

    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 None of these Correct Answer Incorrect Answer

    Solution

    Let the required number = (LCM of denominator 2 and 5) = 10 According to the question, Wrong answer = 2/5 × 10 = 4 Correct answer = 5/2 × 10 = 25 Required percentage of error = (25-4)/25 × 100 = 84%

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