A manufacturer of handcrafted wine racks has determined that the cost to produce x units per...

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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? + Costs are increasing at the rate of $ per month at this production level. (Round to the nearest dollar as needed.). 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? + Costs are increasing at the rate of $ per month at this production level. (Round to the nearest dollar as needed.).