The cost of a product to a retailer is . If the retailer wants his profit to be 20% of the selling price, then at what price should the product be sold?
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Let P be the profit. Then P = 0 . 2 ( 3 . 4 + P ) ⇒ P = 0 . 8 5 . Adding this on to the original price, we get 3 . 4 + 0 . 8 5 = 4 . 2 5 .