The length of a rectangle is halved, while its breadth is tripled. What is the % change in area?
Pick
A) 30 % B) 40 % C) 50 % D) 60 % E) 65 %

Rationale: "let original length = x and original breadth = y . original area = xy . new length = x . 2 new breadth = 3 y . new area = x x 3 y = 3 xy . 2 2 increase % = 1 xy x 1 x 100 % = 50 % . 2 xy c"
Answer: C