Dollar Math

When I can't find a fee-free ATM I'll go to a grocery store and buy a pack of gum with my debit card and get cash back. Between the $2 ATM fee and the $4 my bank charges me for using an unlicensed ATM, it's like I got a free pack of gum and saved another $5. Today the clerk gave me a $50 bill and said she didn't have anything smaller for my cash back. I'm not used to dealing with $50s or ever doing dollar math in these higher denominations. And apparently neither was the guy at the coffee shop. He gave me $12 in change for my coffee, then when I told him I'd paid in a $50 he gave me another $20. It took me a few hours to realize I'd been charged $18 for my coffee. 

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