Departmental Store offers a discount to their customers based on the total bill amount of purchase of n items. Write a C++ program that allows the user to input the unit cost, quantity for n number of items and print the bill of purchase. Use while statement to input the data of n number of items. Compute the total bill and find the discount using the following criteria: For the first RM100-10% of bill amount Next 101-200-8% of bill amount Next 201-300-5% of bill amount Next 300-500-2% of bill amount Above 501 - 1% of bill amount The sample of the bill is given as: Departmental Store, Kuala Lumpur Number of items purchased: 5 Nos. Gross bill amount: RM 150 Discount: RM 14 Total bill amount to be paid: RM 136 Note: use comments wherever documentation is required.