Common sense never was! Albert Einstein said many years ago "Common sense is the collection of prejudices acquired by age eighteen."
Nothing drives me crazy more than a bunch of old coots sitting around talking about common sense! And yes, I am old!
I don't agree.
It is common sense to not text while driving. I was well over 18 when texting came about.
At at drive through window recently I handed the cashier $21.50 for a purchase that came to $6.35. They couldn't figure it out. Had to wait until the mgr had time to come over to assist.
Well, that is different than what the OP posted. If you had given $21.35, sure, very simple math.
Arent registers just fany calculators though? Purchase price is $x.xx, enter customer amount paid $x.xx and the machine tells the difference?
Never worked retail so no idea.