Revenue, cost, and profit. The total cost and the total rev- enue (in dollars) for the production and sale of x hair dryers are given, respectively, by oo = 40x – 0.1x² 0 < x < 400 C(x) = 5x +2,340 and R(x) - (A) Find the value of x where the graph of R(x) has a hori- zontal tangent line. nt ouv (B) Find the profit function P(x). mis (C) Find the value of x where the graph of P(x) has a horizontal tangent line.

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