Do you personally know how much your employer pays in tax to employ you? I bet most people dont have any idea. I just had to look it up myself. I would never know if the rate changed provided I didnt read about it in the paper.
I’d argue you could do the same with anything, in the case of restaurants just show the actual total on the menu and include a breakdown on the receipt so people who care can see how much is going to taxes and such.