Multiple time discount

[sukasem]

I don’t know exactly what your question is.
Is it something like this?

1 beer R$4, 3 beers R$10 Promotion

Coca Cola has offered me to do a promotion for one of the beers that they sell, KAISER. So the deal is that 1 beer will cost R$4, and 3 beers will cost R$10. I have at least 3 different approachs to do this, VERY simple, add a menu item 3 BEER KAISER at R$10. (I dont like this approach very much) SIMPLE, but need to have good memory. add a menu item 3rd Beer KAISER and put he difference price (I like it even less) add a rule that detects the 3rd beer and decreases the price to X. (I like th…

Post your screen step by step so, people can understand.