Add to your solution in Exercise 7 by including two more sizes, XSmall and XXLarge. Add statements that process the order by calculating the total cost.

Each shirt is $16 except the XSmall and XXLarge; their specialty prices are

$20.00 each. Allow users to purchase different sizes on the same order. Include an ‘‘Add to Cart’’ option from the Process menu that enables the user to add multiple selections to the order. Display the total cost for each selection and the final cost for the order. Include a Help menu option that displays instructions.