Question: A store estimates that its cost when selling x lamps per day is C dollars, where C = 40x + 30 (the marginal cost per

A store estimates that its cost when selling x lamps per day is C dollars, where C = 40x + 30 (the marginal cost per lamp is $40). If daily sales are rising at the rate of three lamps per day, how fast are the costs rising? Explain your answer using the chain rule.

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