a) -99%
b) -100%
c) +99%
d) +100%
Answer: a
Explanation: Actual result = 10x
By mistake it has been divided by 10 = $$\frac{x}{{10}}$$
%Change = $$ {\frac{{10x – \left( {\frac{{10}}{x}} \right)}}{{10x}}} $$ × 100 = 99 = -99%
Since, actual value is greater than the wrong value.
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