what is the normal price of an article sold at $ 36 after two successive discounts of 10 % and 20 % ?
"0.8 * 0.9 * cost price = $ 36 cost price = $ 50 the answer is c ."
divide(36, multiply(divide(subtract(const_100, 10), const_100), divide(subtract(const_100, 20), const_100)))