Irwin is a monopoly seller of specialty bearings. Consider the accompanying graph, which illustrates the demand and marginal revenue curves for lnvin's 30weight ball bearings, along with the marginal and average total costs of producing bearings. Price ($/ dozen) $100 \\ 60 100 130150 170 Quantity of bearings (dozens) How much prot does Irwin eam from selling at the prot-maximizing level of price and quantity? (Please ignore "dozens")