a dishonest dealer professes to sell goods at the cost price but uses a weight of 900 grams per kg , what is his percent ?
"900 - - - 100 100 - - - ? = > 11.11 % answer : a"
subtract(multiply(divide(const_100, 900), multiply(const_100, multiply(add(const_3, const_2), const_2))), const_100)