Create a ShippedOrder class that derives from Order. A ShippedOrder has a $4.00 shipping fee (no matter how many items are ordered). Override any methods in the parent class as necessary. Write a new...

Create a ShippedOrder class that derives from Order. A ShippedOrder has a $4.00 shipping fee (no matter how many items are ordered). Override any methods in the parent class as necessary. Write a new application that creates an array of fi ve ShippedOrders. Prompt the user for values for each, and do not allow duplicate order numbers; force the user to reenter the order when a duplicate order number is entered. When fi ve valid orders have been entered, display them all, plus a total of all orders. Save the program as OrderDemo3.cs.