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12-01-2018
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A dealer bought an item for $7, sold it for $8, bought it back for $9, and sold it for $10. how much profit did she make?

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25-01-2018

First spent $7 on the item that will be - 7
Got $8 when he sold it so + 8
Bought the item for $9, so - 9
Again sold it for 10 make it + 10
Final profit will be P = - 7 + 8 - 9 + 10
Profit = $2

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