Question 66
A number is increased by 10% and then reduced by 10%. After this operation, the number
Solution
Let number be 100
When it is increased by 10%, => new number = 110
When it is decreased by 10%, => new number = $$\frac{90}{100}\times110=99$$
Thus, original number decrease by 1%.
[Method 2]
% Change = $$10+(-10)+\frac{10\times(-10)}{100}$$
= $$-1\%$$
=> Ans - (B)
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