The Briley Corporation is the only producer of a particular type of laser. The demand curve for its product is Q = 8,300 - 2.1P and its total cost function is TC = 2,200 + 480Q + 20Q2 where P is price (in dollars), TC is total cost (in dollars), and Q is monthly output. Derive an expression for the firm's marginal revenue curve. To maximize profit, how many lasers should the firm produce and sell per month? If this number were produced and sold, what would be the firm's monthly profit?