increasing the original price of an article by 10 percent and then increasing the new price by 10 percent is equivalent to increasing the original price by
"1.1 * 1.1 * x = 1.21 * x the answer is d ."
multiply(const_100, subtract(multiply(add(const_1, divide(10, const_100)), add(const_1, divide(10, const_100))), const_1))