The tax on a commodity is diminished by 20% but its consumption is increased by 10%. Find the decrease percent in the revenue derived from it?  Choose the correct choice from the following answers:  A) 22%  B) 15%  C) 19%  D) 12%  E) 10%
100 * 100= 
<gadget id="calculator">100 * 100</gadget>
<output>10_000</output>
10000   80 * 110= 
<gadget id="calculator">80 * 110</gadget>
<output>8_800</output>
8800   10000------- 1200   100 ------- ?= 12%   Answer:12%
<result>D</result>
The tax on a commodity is diminished by 20% but its consumption is increased by 10%. Find the decrease percent in the revenue derived from it?