The tax on a commodity is diminished by 30% but its consumption is increased by 20%. Find the decrease percent in the revenue derived from it?	Choose the correct choice
A) 18 %  B) 72 %  C) 32 %  D) 16 %  E) 52 %

Rationale: 100 * 100 = 10000 70 * 120 = 8400 10000 - - - - - - - 1600 100 - - - - - - - ? = 16 % answer : d
Answer: D