what is annual ecomic profit and what is annual operating cost profit

Upon graduating with an accounting degree, you open your own accounting firm of which you and your assistant are the only employees. To start the firm you passed on a job offer with a large accounting firm that offered you a salary of $75,000 annually. Last year you earned a total revenue of $180,000. Rent and supplies last year were $80,000. Your assistant's salary is $45,000 annually