Additionally, how many meals and/or drinks would they serve per day on average?
Western and central Europe only, middle to late middle ages only. That is still half a millennium and a lot of different places, so the answer is generic.
There were small taverns, there were large taverns, there were small inns, there were large inns. Some had a few dozen customers per day, some had hundreds.
Reverly at an inn by Jan Steen, second half of the 17th century. Post-medieval, and set in the great hall of an inn instead of a tavern, but close enough.
In the western world, taverns and inns would sell a lot of ale (= sort of beer) and wine; even a not-very-large tavern would expect to sell tens of gallons (at least a hundred liters) of ale or wine per day; a large tavern could go through several barrels of ale or wine in a day. Medieval taverns did not sell wine by the "drink", by rather by the jug, which would be one or two liters in modern units; beer was sold by the tankard, between half a liter (one pint) and a liter (two pints).
Note that in wine-producing countries beer was not drunk during the Middle Ages; on the other hand, wine was imported in large quantities in England and other such not-wine-producing lands.
It is hard to get a correct idea of the prices, because most prices were in silver, and the price of silver crashed after the discovery of the New World. (The western and central European Christian nations did not have any functional gold currency in the Middle Ages; only the shrinking Roman Empire and the Islamic world did.) To form an idea, a gallon (4 liters) of wine could be about 4 to 6 grams of silver (1/8 to 1/5 oz), which would be about 3 to 4 dollars or euros in 2023 money; beer was less than half that, but beer was not popular at all in places where wine grapes grow. (Keep in mind that silver was much more valuable in the Middle Ages, so a better approximation would be maybe 9 to 12 dollars.)
While taverns did sell food, it was not their main business. (But remember that beer was food in the Middle Agesl; a person could drink a gallon, or 4 liters, of ale per day.) The food sold at taverns was mostly bread and cheese, with the occasional roasted meat. People who did not eat at home bought food from street vendors. Inns did sell food as a main business, mostly for the people lodged there.
In the Islamic world inns did not sell alcoholic beverages. I don't even think they had taverns comparable to the western world; they did have inns, and the inns did sell food.
Kenneth Hodges's Medieval price list.
Medieval prices and wages at Datawrapper.
Prices and costs in Anglo-Saxon England and the Viking Age at Regia Anglorum.
Medieval inns and taverns at the Lost Kingdom.
And, of course, Ian Mortimer's The Time Traveler's Guide to Medieval England: A Handbook for Visitors to the Fourteenth Century; the link goes to Amazon. A brief extract with a list of prices is availalble at Historia Extra.