A manufacturer of handcrafted wine racks has determined that the cost to produce x units per month is given by C = 0.4x² +9,000.

Question

A manufacturer of handcrafted wine racks has determined that the cost to produce x units per month is given by C = 0.4x² +9,000. How fast is the cost per month changing when production is changing at the rate of 13 units per month and the production level is 80 units?

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