You are manager of Mickey's Ice Cream Parlor.
As manager, you get to set the prices and decide when to have a 20% off sale. Prices are set on the Prices window (under Menu Help). To change an item's regular price, click on the price and enter the revised price in cents (no decimal). Sale prices are calculated for you.
Sound is supported. You can turn the sound on/off from the Menu bar. Sound setting and prices are saved between sessions.
The main screen keeps track of what is ordered and the subtotal. When the order is completed, click on the "Total" button and a 4.5% tax is added. Enter the customer's cash amount and his change is calculated.