For example, when you’re in a sit down eating establishment and your waiter/waitress is bringing you your food and drink, taking your orders, you’re expected to leave them a fairly high-percentage tip, about 20% of your bill, give or take a few points in either direction.
If you’re picking up a coffee and a croissant from your local cafe, tossing some change or a dollar bill into the tip jar is considered acceptable.
But new POS systems have introduced percentage-based tips for coffee orders as well.
Source: https://www.distractify.com/p/inflated-tip-options