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 14 units per month and the production level is 80 units? Costs are ▼at the rate of $ (Round to the nearest dollar as needed.) (...) per month at this production level.

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