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 encourage 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 shipping formatted charges.