Prices for food in a restaurant is not that hard to calculate: you figure the cost of one plate of food, multiply it by four and that is price to be charged before taxation.

One part is for the pantry. One part is for the kitchen staff. One part is for the room staff. One part is for the house.

Not hard to figure.

Drinks and beverages are basically all profit, unless you want to drink water with a refined meal (the healthiest/best option but most people won’t), so you will pay for a soft drink twice or triple what it costs you at the store and lets not start talking about wines, beers or, even worse, spirits.