I'm in retail and have to do the rounding up or down with change. I'm a generous rounder (don't tell my boss, LOL) and usually only go up if the amount ends in 4.

we have always taken US coin at parr and even most vending machines take Us coin.
I hope that they don't do away with all coins and I know that they would like to do away with cash, period. At my age I still like the option of cash or card, you can't track cash and cards can be easily controlled by outside forces.