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@tbr
The average tab is 148 bucks.
Open tabs 1894.
148 × 1894 = 273.652 bucks
The average income is ~2500 bucks/month.
273.652 ÷ 2500 = 109,46 months =~ 9 years.

[1] How many beers has person A drank?
[2] How many years person A needed to drink them?
[3] Calculate the delta between the result of [2] and the time person A has to work in the bar.

PS: die neuen Abi Fragen in Mathe für Bayern.