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 ?
"100 * 100 = 10000 78 * 109 = 8502 10000 - - - - - - - 1200 100 - - - - - - - ? = 15 % answer : c"
subtract(const_100, divide(multiply(add(const_100, 9), subtract(const_100, 22)), const_100))