a shopkeeper labeled the price of his articles so as to earn a profit of 20 % on the cost price . he then sold the articles by offering a discount of 10 % on the labeled price . what is the actual percent profit earned in the deal ?
"explanation : let the cp of the article = rs . 100 . then labeled price = rs . 120 . sp = rs . 120 - 10 % of 120 = rs . 120 - 13 = rs . 118 . gain = rs . 118 â € “ rs . 100 = rs . 18 therefore , gain / profit percent = 18 % . answer : option d"
subtract(subtract(add(const_100, 20), multiply(add(const_100, 20), divide(10, const_100))), const_100)