Lisa bought stock three years ago and sold it today for a profit of $1,200. this is a

Well if you are looking for the profit margin we need how much is was when she bought it, because it doesn't say, you can't say It's a increase or a decrease, so you could say this is a investment.
But considering you put this under mathematics I assume there is more to this question you forgot to post.

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i would like to talk and i have no idea

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