Question
A student multiplied a number by 8/5 instead of 5/8.
What is the percentage error in the calculation?Solution
Let the required number = (LCM of denominator 5 and 8) = 40 According to the question, Wrong answer = 8/5 times; 40 = 64 Correct answer = 5/8 times; 40 = 25 Required percentage of error = [(64 - 25)/25]times; 100 = 156%
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