A number is increased by 20% and then decreased by 20%, the final value of the number is ?	Choices.
A) does not change B) decreases by 2% C) increases by 4% D) decreases by 4% E) None of these
Here, x = 20 and y = - 20   Therefore, the net % change in value   = ( x + y + xy/100)%   = [20 - 20 + (20x - 20)/100]% or - 4%   Since the sign is negative, there is a decrease in value by 4%.   ANSWER:decreases by 4%
<result>D</result>
A number is increased by 20% and then decreased by 20%, the final value of the number is ?