The length of a rectangle is increased by 40% while its width is halved. What is the % change in area?
Pick:
A) 25 %
B) 30 %
C) 50 %
D) 65 %
E) 70 %

Rationale: the original area is l * w the new area is 1.4 l * 0.5 w = 0.7 * l * w = l * w - 0.3 * l * w the area decreased by 30 % . the answer is b .
Answer: B