My most expensive INVOICE for food photography was about RM 3,000 for about 4 hours work. This also included delicious meal from the client that's worth a few hundred.

For 10 menu items, RM 800 averages to about RM 80 per photo which I think is alright. It depends on what effort you put in as well.

Some people prefer to be quoted "per photo". sometimes "per job" basis would be easier.