Question: A furniture manufacturer makes two types of furniture - chairs and sofas. The cost per chair is $350, the cost per sofa is $925, and the sales tax rate is 5%.

Program: Write a Visual Basic program to create an invoice form for an order. (See the diagram below.) After the data on the left side of the form are entered, the user can display an invoice in a list box by pressing the Process Order button. The user can click on the Clear Order Form button to clear all text boxes and the list box, and can click on the Quit button to exit the program.

The invoice number consists of the capitalized first two letters of the customer's last name, followed by the last four digits of the zip code. The customer name is input with the last name first, followed by a comma, a space, and the first name. However, the name is displayed in the invoice in the proper order.

The generation of the invoice number and the reordering of the first and last names should be carried out by Function procedures.

Prepare this program in Visual Basic and add comments in code section that will be useful in the future.