A student multiplied a number by 2/5 instead of 5/2. What is the percentage error in the calculation?

82%
86%
84%
89%

Correct Answer: 84%

Explanation:

Let the number be N.
Then, error = 5N/2 - 2N/5 = 21N/10
∴ Error percentage = (21N/10) x (2/5N) x 100 % = 84%

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