Don't worry excessively about making the applet look good. Before you can do that you'll need to learn about layout managers.
Don't worry about minimum wage, number of hours in the week, or other error conditions we checked before. In the event the user enters data that cannot be interpreted as a number, don't put anything in the output text field. In a couple of weeks, you'll learn how to bring up an error dialog to handle these conditions.
Don't worry excessively about making the applet look good. Before you can do that you'll need to learn about layout managers. We'll cover them next week.