two numbers are respectively 50 % and 100 % more than a third number . the percentage that is first of the second is ?
"i ii iii 150 200 100 200 - - - - - - - - - - 150 100 - - - - - - - - - - - ? = > 75 % answer : e"
subtract(const_100, multiply(divide(add(50, const_100), add(100, const_100)), const_100))