the tax on a commodity is diminished by 10 % and its consumption increases by 10 % . find the effects on revenue ?
"since tax consumption = revenue . therefore , net % change in revenue = ( x + y + xy / 100 ) % = [ - 10 + 10 + ( - 10 x 10 ) / 100 ] % or - 1 % . therefore , revenue decreased by 1 % . answer : a"
subtract(const_100, multiply(multiply(add(const_1, divide(10, const_100)), subtract(const_1, divide(10, const_100))), const_100))