The tax on a commodity is diminished by 22% but its consumption is increased by 9%. Find the decrease percent in the revenue derived from it?  Options: A) 20% B) 18% C) 15% D) 12% E) 14%
100 * 100= 
<gadget id="calculator">100 * 100</gadget>
<output>10_000</output>
10000   78 * 109= 
<gadget id="calculator">78 * 109</gadget>
<output>8_502</output>
8502   10000------- 1200   100 ------- ?= 15%   ANSWER:15%
<result>C</result>
The tax on a commodity is diminished by 22% but its consumption is increased by 9%. Find the decrease percent in the revenue derived from it?