A) 60.94 per cent
B) 156 per cent
C) 30.47 per cent
D) 78 per cent
Correct Answer: A
Solution :
Let the number be\[x\] Correct product \[=\frac{8x}{5}\] Incorrect product \[=\frac{5x}{8}\] Error \[\frac{8x}{5}-\frac{5x}{8}\] \[\frac{64x-25x}{40}=\frac{39x}{40}\] \[\therefore \]Percentage error \[=\left( \frac{\frac{39x}{40}}{\frac{8x}{5}} \right)\times 100\] \[=\frac{39x}{40}\times \frac{5}{8x}\times 100\approx 60.94%\]
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