The tax on a commodity is diminished by 30% but its consumption is increased by 20%. Find the decrease percent in the revenue derived from it?  Pick one:
A) 18%
B) 72%
C) 32%
D) 16%
E) 52%
100 * 100= 
<gadget id="calculator">100 * 100</gadget>
<output>10_000</output>
10000   70 * 120= 
<gadget id="calculator">70 * 120</gadget>
<output>8_400</output>
8400   10000------- 1600   100 ------- ?= 16%   Answer:16%
<result>D</result>
The tax on a commodity is diminished by 30% but its consumption is increased by 20%. Find the decrease percent in the revenue derived from it?