WARNING: This program has a syntax error, which means we need to debug it!
RULE: Variables MUST be defined before they can be used in commands.
- Click Run and read the error message.
- Debug the program so that .Display() uses the argument: number_sold.
.Display() is a command that has a variable name AND takes a variable argument.
To navigate the page using the TAB key, first press ESC to exit the code editor.