What does "Is the tip included?" mean in English for Spanish?

In English for Spanish, "Is the tip included?" means:

¿Está incluida la propina?

Listen to "Is the tip included?": (If you have an HTML5 enabled browser, you can listen to the native audio below)

This is a phrase that is used in the GamesForLanguage English for Spanish Language Game in the following scenes:

• English for Spanish 3, Level 3, Scene 3