The height of a triangle is decreased by 5% and its base increased by 10%. Its area will Choose the correct choice from the following
A) decrease by 12.5 %	B) increase by 12.5 %	C) increase by 4.5 %	D) increase by 25 %	E) none of these

Rationale: explanation : let the initial height be 100 and the base be 200 units . â ˆ ´ area = 1 / 2 x 100 x 200 = 10000 sq units now , height = 95 units and base = 220 units â ˆ ´ new area = 1 / 2 x 95 x 220 = 10450 â ˆ ´ area is increased by ( 10450 - 10000 ) / 10000 x 10 = 4.5 % answer : option c
Answer: C