The tax on a commodity is diminished by 19% and its consumption increased by 15%. The effect on revenue is?	Pick one
A) 2 %  B) 8.85 %  C) 5.85 %  D) 6.85 %  E) 1 %

Rationale: "100 * 100 = 10000 81 * 115 = 9315 - - - - - - - - - - - 10000 - - - - - - - - - - - 685 100 - - - - - - - - - - - ? = > 6.85 % decrease answer : d"
Answer: D