As far as cashiers sucking at math...
I've worked as a cashier a bit. I'm not stellar at arithmetic, but probably better than most. But when I am a worker drone, scanning items, swiping cards, fake smiling, been working for 4 hours without a break...then someone interrupts the change giving process, my brain freezes up. I don't want to make a mistake, and it takes an extra long time for my brain to switch out of automated mode, back into "I know how to do math" mode.
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