A) 56.25 percent
B) 18 percent
C) 28.13 percent
D) 36 percent
Correct Answer: D
Solution :
Correct product \[=\frac{5x}{4}\] Where number \[=x\] Incorrect product \[=\frac{4x}{5}\] Error \[=\frac{5x}{4}-\frac{4x}{5}\] \[=\frac{25x-16}{20}=\frac{9x}{20}\] \[\therefore \]Error per cent \[\frac{\frac{9x}{20}}{\frac{5x}{4}}\times 100\] \[=\frac{9x}{20}\times \frac{4}{5x}\times 100=36%\]
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