What is the percentage increase in the area of a rectangle, if each of its sides is increased by
20 % ? Choose one
A) 42 % B) 43 % C) 45 % D) 44 % E) 46 %

Rationale: let original length = l original breadth = b then original area = lb length is increased by 20 % ⇒ new length = l × 120100 = 1.2 l breadth is increased by 20 % ⇒ new breadth = b × 120100 = 1.2 b new area = 1.2 l × 1.2 b = 1.44 lb increase in area = new area - original area = 1.44 lb − lb = 0.44 lb percentage increase in area = increase in areaoriginal area × 100 = 0.44 lblb × 100 = 44 % answer is d .
Answer: D