Carla sells hot coffee, cider, and tea from a sidewalk cart near Wall Street in New York City. Last month she sold $4,500 worth of product to 1,000 customers. She spent $800 on buying her beverages in bulk. Her monthly costs are: Utilities = $100, Salary = $2,000, Advertising = $0, Insurance $0, Interest = $0, Rent (cart) = $600, Depreciation = = $0. What are Carla's fixed costs? $2,000 O $3,000 $2,700 O $4,000 O $3,700