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  1. Salary of a person is increased by 20%, then it is decreased by 20%. Change in his salary is :
    1. 4% decreased
    2. 4% increased
    3. 8% decreased
    4. neither decrease nor increase
Correct Option: A

If the value of a number is first increased by y % and later decreased by y %, the net change is always a decrease

which is equal to
y2
%
100

Here , y = 20%
∴ Required decrease =
20 × 20
= 4%
100



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