New SEBI Grade A IT Stream New Batch Starts on Nov 30. Click Here to Enroll

    Register

    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%

    Practice Next