If the height of a triangle is decreased by 40%, land its base is increased by 40%, what will be the effect on its area?  Choose the correct choice from the following:
A) no change	B) 16 % increase	C) 8 % decrease	D) 16 % decrease	E) none of thes

Rationale: regd effect = ∣ ∣ 40 − 40 − 40 × 40100 ∣ ∣ % = − 16 % | 40 − 40 − 40 × 40100 | % = − 16 % i . e . , the area will decrease by 16 % answer d
Answer: D