a dishonest dealer professes to sell goods at the cost price but uses a weight of 800 grams per kg , what is his percent ?
"800 - - - 200 100 - - - ? = > 25 % answer : b"
subtract(multiply(divide(const_100, 800), multiply(const_100, multiply(add(const_3, const_2), const_2))), const_100)