The tax on a commodity is diminished by 17% and its consumption increased by 15%. The effect on revenue is?
Pick one:
A) 2 %
B) 8 %
C) 4.5 %
D) 6.5 %
E) 1.5 %

Rationale: "100 * 100 = 10000 83 * 115 = 9545 - - - - - - - - - - - 10000 - - - - - - - - - - - 455 100 - - - - - - - - - - - ? = > 4.55 % decrease answer : c"
Answer: C