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Calculate the marginal cost

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The total cost (in dollars) of producing x food processors is

C(x)= 2500+90x-0.2x^2 (x-squared)

(A) Find the exact cost of producing the 61st food processor.
(B) Use the marginal cost to approximate the cost of producing the 61st food processor.

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The solution shows how to calculate the marginal cost in detail, using step by step formula.

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(a) the cost of producing x = 60 processors is
C(x = 60) = 2500 + 90 * 60 - 0.2 * 60^2 = 7180
The cost of producing x = 61 ...

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