It is usual in England to split the bill when out with friends at a restaurant. Normally everyone would pay the same amount but if you had a meal that was a lot more than others or if you were drinking wine and others were drinking water you would probably offer to pay more.

What is AA?

Thank you.

AA system in English is "Going Dutch". Here's the definition of "Going Dutch" according to Wikipedia.com, 'There are two possible senses—each person paying his own expenses, or the entire bill being split (divided evenly) between all participants. In strict usage, "Going Dutch" refers to the former, paying one's own expenses, and the latter is referred to as "splitting the bill", but in casual usage these may both be referred to as "going Dutch".' http://en.wikipedia.org/wiki/Dutch_treat