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Minimizing Marginal Cost The marginal cost of a product can be thought of as the cost of producing one additional unit of output. For example, if the marginal cost of producing the 50th product is $6.20, it cost $6.20 to increase production from 49 to 50 units of output. Suppose the marginal cost C (in dollars) to produce x thousand mp3 players is given by the function
C(x) = x2 – 140x + 7400)

Minimizing Marginal Cost
(See Problem 83).
3.3 #84
The marginal cost C (in dollars) of manufacturing x cell phones (in thousands) is given by
C(x) = 5x2 – 200x + 4000.
(a) How many cell phones should be manufactured to minimize the marginal cost?
(b) What is the minimum marginal cost?
I have to answer the second (a,b) question but use the first as a reference.

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