Suppose that the cost (in dollars) for a company to produce $x$ pairs of a new line of jeans is $C(x)=2000+3x+.01x^2+.0002x^3$.
(a) Find the marginal cost function.
(b) Find $C'(100)$. (What does this mean?)
(c) Find the cost of manufacturing the $101^{st}$ pair of jeans.

(a) $C'(x)=$
(b) $C'(100)=$ dollars/pair
(c) Cost = dollars