. Programming Exercise A software company sells a package that uses a variable retailCost which is an user input. Quantity discounts are given according to the following table: Quantity Discount 5 9 10% 10 -19 20% 20 49 30% 50 or more 40% Write a program that asks for the number of units sold and computes the total cost of the purchase. The formula to be used is: Cost = Number of Units Sold * RetailCost * (1 0.01*Discount) dollars, Use if else statement to first decide on the Discount, then use the formula to compute the cost and then display the cost.