a dishonest dealer professes to sell goods at the cost price but uses a weight of 920 grams per kg , what is his percent ?
"920 - - - 80 100 - - - ? = > 8.7 % answer : e"
subtract(multiply(divide(const_100, 920), multiply(const_100, multiply(add(const_3, const_2), const_2))), const_100)