Corrina was working as a waitress in an Italian restaurant making an annual income of $25,000 per year when she decided to start up her own catering business.

Corrina used $10,000 of her savings that was earning 5 percent annual interest to establish her business. After the first year she made an accounting profit of $20,000. Her economic profit was A) $5,550.
B) -$5,000.
C) $20,000.
D) $25,000.