Marginal Cost A manufacturer estimates that the hourly cost of producing x units of a product on an assembly line is C(x) = .1x3 − 6x2 + 136x + 200 dollars.
(a) Compute C(21)-C(20), the extra cost of raising the production from 20 to 21 units.
(b) Find the marginal cost when the production level is 20 units.
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