The tax on a commodity is diminished by 20% but its consumption is increased by 15%. Find the decrease percent in the revenue derived from it? Choose the correct choice from the following choices.
A) 12 %  B) 14 %  C) 16 %  D) 20 %  E) 8 %

Rationale: "explanation : 100 * 100 = 10000 80 * 115 = 9200 10000 - - - - - - - 800 100 - - - - - - - ? = 8 % e )"
Answer: E