Problem
Electricity is sold for $0.12 per kilowatt-hour (kWh) for the first 10,000 units each month and $0.09/kWh for all remaining units. If a firm uses 14,000 kWh/month, what is its average and marginal cost?
The response should include a reference list. Double-space, using Times New Roman 12 pnt font, one-inch margins, and APA style of writing and citations.