THIS PROGRAM MUST BE WRITTEN IN C++

A software company sells a package that retails for $99. Quantity discounts are given based on the table below. Write a program that prompts the user for the number of units sold and calculates the total cost of the purchase. Store the retail cost in the named constant UNIT_PRICE and use the constant in all calculations. Input Validation: Make sure the number of units is greater than 0. Quantity. Discount 10 - 19 20 - 49 50-99 100 or more 20% 30% 40% 50%