100 off an item for sale?!

Why do people say 100 OFF screws when they're selling 100 OF them? It's of, not off:

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Reply to
Commander Kinsey
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Maybe it's like saying "100 number" as opposed to "100 lbs"; i.e. a unit designation.

Reply to
Max Demian

I would never say "100 number", that's illogical, did you mean "100 in number"? I'd say "100 units", or "100 pieces", or "100 of them". Or advertise it as "100 pk" (as in pack of 100).

Reply to
Commander Kinsey

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