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

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

Let the number be 'x' Then, according to the given data, 5 2 x - 2 5 x 5 2 x x 100 = 21 25 x 100 = 84%

52%
64%
84%
77%

Correct Answer: 84%

Explanation:

Let the number be 'x'

Then, according to the given data,

$\frac{\frac{5}{2}}{x} x 100$

= $\frac{21}{25} x 100$

= 84%

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