The total cost and the total revenue (in dollars) for the production and sale of x ski jackets are given by C(x)=26x+18,625 and R(x) 200x-0.2x for 0 sxs 1000. (A) Find the value of x where the graph of R(x) has a horizontal tangent line Find the profit function P(x). (B) (C) Find the value of x where the graph of P(x) has a horizontal tangent line. 作

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