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## Homework Statement

suppose that the dollar cost of producing x washing machines is c(x)= 2000 + 100x-0.1x6^2

a) find the average cost of producing 100 washing machines.

b) find the marginal cost when 100 washing machines are produced.

## Homework Equations

c(x)= 2000 + 100x-0.1x6^2: the only equation given

## The Attempt at a Solution

i've tried taking the derivative and then substituting it with 100. for part a and for part b i didnt take the derivative, just plugged in 100 into the equation given