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c(x) = 0.000002x^3 +5x+362
average cost = C(x) /x = 0.000002x^2 +5 + 362 /x
marginal cost , C'(x) = 0.000006x^2 +5
C'(1000)= 0.000006*1000^2 +5 = 11
Marginal cost of producing 1000 such objects is $11
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