The tax on a commodity is diminished by 10% and its consumption increases by 10%. Find the effects on revenue ?	Answers:  A) 1 % decrease  B) 2 % increase  C) 3 % decrease  D) 4 % decrease  E) none of these

Rationale: "since tax consumption = revenue . therefore , net % change in revenue = ( x + y + xy / 100 ) % = [ - 10 + 10 + ( - 10 x 10 ) / 100 ] % or - 1 % . therefore , revenue decreased by 1 % . answer : a"
Answer: A