A number is increased by 40% and then decreased by 40%, the final value of the number is ?	Choose the correct choice:
A) decrease by 13%	B) decrease by 12%	C) decrease by 16%	D) decrease by 14%	E) decrease by 15%
Here, x = 40 and y = - 40   Therefore, the net % change in value   = ( x + y + xy/100)%   = [40 - 40 + (40 * -40)/100]% or - 16%   Since the sign is negative, there is a decrease in value by 16%.   ANSWER: decrease by 16%
<result>C</result>
A number is increased by 40% and then decreased by 40%, the final value of the number is ?