total cost (in dollars) of producing xx golf clubs per day is given by the formula C(x)=450+110x−0.3x2.C(x)=450+110x−0.3x^2   (A) Find the marginal cost at a production level of xx golf clubs.   C'(x) = ____   (B) Find the marginal cost of producing 55 golf clubs. Marginal cost for 55 clubs = ___

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