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  1. A student multiplied a number by 2/5 instead of 5/2. What is the percentage error in the calculation ?
    1. 82%
    2. 86%
    3. 84%
    4. 89%
Correct Option: C

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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