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John sells necklaces on the beach. He sold the necklaces for $10 each and his sales...

John sells necklaces on the beach. He sold the necklaces for $10 each and his sales averaged 20 per day. When he increased the price by $1, he found that the average decreased by two sales per day. Assume the price is a linear function of the demand. If the material for each necklace costs John $6, what should the selling price be to maximize his profit?

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