The tax on a commodity is diminished by 10% and its consumption increased by 20%. The effect on revenue is?	Choose one:
A) 2% decrease B) 8% increase C) 9% decrease D) 3% decrease E) 2% decrease
100 * 100= 
<gadget id="calculator">100 * 100</gadget>
<output>10_000</output>
10000   90 * 120= 
<gadget id="calculator">90 * 120</gadget>
<output>10_800</output>
10800   -----------   10000-----------800   100-----------?=&gt; 8% increase   Answer: 8% increase
<result>B</result>
The tax on a commodity is diminished by 10% and its consumption increased by 20%. The effect on revenue is?