A manufacturer of handcrafted wine racks has determined that the cost to produce x units per month is given by C = 0.4x + 10,000. How fast is the cost per month changing when production is changing at the rate of 12 units per month and the production level is 60 units? Costs are Vat the rate of $ per month at this production level. (Round to eded.) decreasing increasing (1,1) More

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