the tax on a commodity is diminished by 19 % and its consumption increased by 15 % . the effect on revenue is ?
"100 * 100 = 10000 81 * 115 = 9315 - - - - - - - - - - - 10000 - - - - - - - - - - - 685 100 - - - - - - - - - - - ? = > 6.85 % decrease answer : d"
subtract(const_100, multiply(multiply(add(const_1, divide(15, const_100)), subtract(const_1, divide(19, const_100))), const_100))