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    5. A student multiplied a number by 8/5 instead of 5/8. What is the percentage error in the calculation

    Question

    A student multiplied a number by 8/5 instead of 5/8.

    What is the percentage error in the calculation?
    A 127% Correct Answer Incorrect Answer
    B 164% Correct Answer Incorrect Answer
    C 156% Correct Answer Incorrect Answer
    D 124% Correct Answer Incorrect Answer
    E 146% Correct Answer Incorrect Answer

    Solution

    Let the required number = (LCM of denominator 5 and 8) = 40 According to the question, Wrong answer = 8/5 × 40 = 64 Correct answer = 5/8 × 40 = 25 Required percentage of error = (64-25)/25 × 100 = 156%

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