The tax on a commodity is diminished by 20% and its consumption increased by 25%. The effect on revenue is?  Pick
A) 2 % decrease	B) 8 % decrease	C) 9 % decrease	D) 0 % no change	E) 2 % decrease

Rationale: "100 * 100 = 10000 80 * 125 = 10000 - - - - - - - - - - - 10000 - - - - - - - - - - - 0 100 - - - - - - - - - - - ? = > 0 % no change answer : d"
Answer: D