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Econ 528 Cheat Sheet Marginal Cost, [pic 1]To find the profit-maximizing price, we need to find the price at which MR = MC.[pic 2], plug MR = MC to find the quantity[pic 3]Profit-maximizing price (plug the quantity from above)Total monthly profit, = P.Q – TC[pic 4]Output level that will maximize the profit, Profit maximization requires:.