"When someone wants to pay in cash it would be a good idea to avoid bills less than 50. it took a half an hour to count it all."

another thing to be aware of, if receiving a lot of cash in 100's (or any high denomination) is to have them meet you at your bank and have the bank run the bills through their electronic counter machine, its fast and will kick out any bills that don't meet the test for counterfits. I doubt small bills are counterfit but these days its hard to know. Supposedly the Iranians printed counterfit US money into the many millions of Dollars using equipment that made it really hard to visually detect the anomaly.
DDH

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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!