Carla Sells Hot Coffee, Cider and Tea from a Sidewalk

Multiple Choice

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) = $500, Depreciation = $0. What is Carla's monthly cost of goods sold?

A) $800
B) $600
C) $450
D) $100