The former, and the cashier can also tell you the price of any item before you have to pay for it. However that doesn't help much if you are a foreigner and don't speak English well.
Well... welcome to the world? You'll have the same issue traveling to South America, Europe, Asia. When you travel and end up in a country where you don't speak the native language, communication gets more difficult. This is a non-issue.
If someone speaks 10.43 to me in German, I have no idea.