The tax on a commodity is diminished by 20% but its consumption is increased by 5%. Find the decrease percent in the revenue derived from it?  Choose the correct choice from the following answers:
A) 12 %	B) 14 %	C) 16 %	D) 20 %	E) 22 %

Rationale: "explanation : 100 * 100 = 10000 80 * 105 = 8400 10000 - - - - - - - 1600 100 - - - - - - - ? = 16 % c )"
Answer: C