In Czech Republic, where I live, the tipping and payment system in restaurants is very convenient. As for the tips, if you paying, say 241 CZK, you don't need to worry about percentage, just round up to 250 and all will be good. Also, if you don't tip and just pay 241, it is totally acceptable, nobody will ever say nothing or look at you wrong. Just "Thank you" as usual. Regarding the payment it is also very convenient: you pay for yourself. E.g. your company at the table ordered very different food, drinks, some of them leaving sooner, some later. So when you finished, you just go to the cashdesk (or wait at the table) and say to the waiter what you had. That's it, you are not bothering with splitting the bills, counting tips or other annoying stuff. So far this is my favorite model of how it can be done.