Melanie sets up her own business. Her hair salon earns $10,000 in revenue a month. She spends $500 per month on supplies (shampoo, brushes, etc). Her...

Melanie sets up her own business. Her hair salon earns $10,000 in revenue a month. She spends $500 per month on supplies (shampoo, brushes, etc). Her tools depreciate at a rate of $600 annually. Before she started her own business, she previously earned $3,000 per month as a hairdresser in another salon. Her equipment is very specialized and has no other uses. What is Melanie's economic profit per month?