My limit is $5.88 per meal including sales tax (no tip). That’s what breakfast costs me at Jack-in-the-Box (with two egg sandwiches).
I went to a restaurant in western Wisconsin and they came to our table with a card swipe machine and on the screen my only options was to tip either 20%, 25% or 30%. If you try and pay in cash they make you select on the screen the same and make change for you at the table while printing the receipt.
No option for no tip......which is what they deserved.