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 C(x)= (.86x + 90)(.86x +70) -600

To find the marginal cost we need to find the rate of change of C.

To do this, we need to work out C(67)-C(66):

C(66)=18003.2976, C(67)=18239.2644.

The difference is 235.9668, which is the marginal cost at x=66.

by Top Rated User (761k points)

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