C# assignment 5: Shipping Charges A large Internet merchandise provider determines its shipping charges based on the number of items purchased. As the number increases, the shipping charges proportionally decrease. This is done to encour- age more purchases. If a single item is purchased, the shipping charge is $2.99. When customers purchase between 2 and 5 items, they are charged the initial $2.99 for the first item and then $1.99 per item for the remaining items. For customers who purchase more than 5 items but less than 15, they are charged the initial $2.99 for the first item, $1.99 per item for items 2 through 5, and $1.49 per item for the remaining items. If they purchase 15 or more items, they are charged the initial $2.99 for the first item, $1.99 per item for items 2 through 5, and $1.49 per item for items 6 through 14, and then just $0.99 per item for the remaining items. Allow the user to enter the number of items purchased. Define appropriate constants, use the decimal data type, and display the ship- ping formatted charges.