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Froeb et al.’s Chapter 4: a. Individual problems: 4-5 and 4-6. Discussion Question 9: How is the concept of a normal return on investment related to the distinction between business and economic profit? Problem 6: Determine which of the two investment projects of Problem 5 the manager should choose if the discount rate of the firm is 20 percent. Problem 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 operations is $120,000 and her expenses are as follows: Salaries to hired help 45,000 Supplies 15,000 Rent 10,000 Utilities 1,000 Interest on bank loan 10,000