How much did the store lose?

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A man walked to a store with a fake N1000 note.
He changed the note to two N500 notes from the sales attendant.
He later went back to the attendant to pay for a N300 worth of goods
using one of the N500, and collected N200.
How much did the store lose?

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The Store lose N1000 (N500 + N200 + N300 worth of goods)