A student multiplied a number by 2/5 instead of 5/2. What is the percentage error in evaluation ?
Solution
Correct Answer: Option C
Let the number be 'x'
Then, according to the given data,
\(\frac{\displaystyle\frac{\mathbf5}{\mathbf2}\mathbf x\boldsymbol-\frac{\mathbf2}{\mathbf5}\mathbf x}{\displaystyle\frac{\mathbf5}{\mathbf2}\mathbf x}\times\mathbf{100}\)
= \(\frac{21}{25}\times100\)
= 84%
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