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Question

A student multiplied a number by 4/5 instead of 5/4.What is the percentage error in the calculation?

A

55%

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B

45%

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C

36%

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D

56.25%

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E

None of These

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Solution

The correct option is C
36%

$\frac{\frac{5}{4} - \frac{4}{5}}{\frac{5}{4}} \times 100 = \frac{25 - 16}{25} \times 100 = 36$

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