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A bookstore can obtain a certain book from the publisher at $3 per
A bookstore can obtain a certain book from the publisher at $3 per copy. the bookstore then sells the book for $15 per copy. however, they are contemplating lowering the price to stimulate sales. the bookstore estimates that for every $1 reduction in price, 20 more books will be sold. at what price should the bookstore sell the book to generate the greatest profit?