An artist is planning to sell signed prints of her latest work. If 60 prints are offered for sale, she can charge $500 each. However, if she makes more than 60 prints, she must lower the price of all the prints by $5 for each print in excess of the 60. That is, 61 prints reduce the price by $5, 62 prints reduce the price by $10, and so on. How many prints should the artist make to maximize her revenue? Let x be the number of prints and p the price per print. The demand equation is p = and the revenue function is R(X) =