Check please!

This has definitely taken some getting used to for me. 

Sometimes when you get a check at a restaurant in Latin America the waiter (waitress) will just tell you the total or give you a blank bill with a figure (see below).

*From an actual restaurant in Iguazú, Argentina.  I don't know about you, but it definitely didn't feel right at first..  

And after more than 4 months here and my many trips to South America, I still have no idea if/when tip is included - it still boggles my mind.  These "informative" checks are by no means helping me solve this mystery any time soon...