The tax on a commodity is diminished by 20% and its consumption increased by 15%. The effect on revenue is?	Pick one
A) 6% B) 8% C) 9% D) 2% E) 1%
100 * 100= 
<gadget id="calculator">100 * 100</gadget>
<output>10_000</output>
10000   80 * 115= 
<gadget id="calculator">80 * 115</gadget>
<output>9_200</output>
9200   -----------   10000-----------800   100-----------?=&gt; 8% decrease   Answer: 8%
<result>B</result>
The tax on a commodity is diminished by 20% and its consumption increased by 15%. The effect on revenue is?