a) The TeeEm Telephone Company assigns you to develop a billing system based on the tariffs below Customer Category Code Rent (RM) Residential 20 25.00 Tariff The first 100 units: RMO 10 per unit The next 200 units: RMO. 15 per unit Over 300 units: RMO 20 per unit The first 200 units: RM0.20 per unit The next 400 units: RM0.25 per unit Over 600 units: RMO 30 per unit The first 300 units: RM0.40 per unit Over 300 units: RM0.50 per unit Commercial 50.00 Industrial 1 100.00 Write a complete C++ program that prompts the user to enter the foilowing data: The customer name The customer address The customer category code The units used Then, the program will calculate the amount due and print the bill. This process will continue as many times as the user wishes and will terminate when the user requests to stop. Upon stopping the billing process, the program will generate a report that displays the following information: The total number of customers in each category The total collection in each category The total collection for the TeeEm Telephone Company (15 marks)