And just how much extra credit does this buy?

Son has opportunity for extra credit in high school geography class. Go to one of 4 Japanese restuarants, have a meal, and write about it. Sounds simple- no big deal that I don't like sushi- according to Daughter, the place we picked has other stuff. So off we head this past Saturday for lunch. One appetizer, 2 soup entrees, one steak teryaki and something that the other party had later the bill arrived......$92! (well, that does include the tip at least) I still cannot figure out what cost so much.
Wonder if the teacher is getting a kickback from the restuarant?