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a student makes and sells necklaces on the beach during the summer.

a student makes and sells necklaces on the beach during the summer. The material for each necklace costs her $6 and she has been selling about 20 per day at $10 each. She has been wondering whether to raise her prices, so she takes a survey and finds that for every dollars increase she would lose two sales a day. What should be her selling price to maximize her profits?

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