You sold it for 8700$. This was 100$ more than two fifths what you originally paid.
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Let P=original price. ⅖ of this is 2P/5, and $100 more is 2P/5+100=8700, because $8,700 was the price it was sold for.

Multiply through by 5: 2P+500=43500. So 2P=43500-500=43000, and P=43000/2=$21,500.

The original price was $21,500.

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