A) - 99%
B) 99%
C) - 100%
D) 100%
Correct Answer: B
Solution :
By mistake \[=\frac{x}{10}\] Actual value \[=x\times 10\] Percentage change \[=\frac{10x-\frac{x}{10}}{10x}\times 100=\frac{99}{100}\times 100\] = 99% Since, actual value is greater than the wrong value. Alternatively Actual result \[=10\times 10=100\] Wrong result \[=\frac{10}{10}=1\] Percentage change \[=\frac{100-1}{100}\times 100=99%\]
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