9.) A woman managing a photocopying establishment for $25,000 per year decides to open her own duplicating place. Her revenue during the first year of operation is $120, 000, and her expenses are as follow: _______________________________________ Salaries to hired help $45,000 Supplies $15,000 Rent $10,000 Utilities $1,000 Interest on bank loan $10,000 ________________________________________ Calculate (a)the explicit costs, (b) the implicit costs (c) the business profit (d) the economic profit and (e) the normal return on investment in the business