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Question

A student multiplied a number by 45 instead of 54. What is the percentage error ?

A
30%
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B
36%
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C
40%
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D
39%
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Solution

The correct option is D 36%
Let the Number be x
Number becomes 45x
If multiplied by 54x
Error =54x45x
=920x
Error percentage =9x×420×5x×100=36%

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