A student multiplied a number by 3/5 instead of 5/3, What is the percentage error in the calculation ?
A) 54 %
B) 64 %
C) 74 %
D) 84 %
Answer: B) 64 %
Explanation:
Let the number be x.
Then, ideally he should have multiplied by x by 5/3. Hence Correct result was 
By mistake he multiplied x by 3/5 . Hence the result with error =
Then, error =
Error % = 
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