The production costs, in dollars, per week of producing x widgets is given by, () = 4000 − 32 + 0.082 + 0.000063 and the demand function for the widgets is given by () = 250 + 0.02 − 0.012. What is the marginal cost, marginal revenue and marginal profit when = 200 and = 400? What do these numbers tell you about the cost, revenue and profit?