A firm has the following total revenue and total cost schedules: TR = $2Q. TC = $4,000 + $1.5Q a. What is the break-even level of output? What is the level of profits at sales of 9,000 units? b. As the result of a major technological breakthrough, the total cost schedule is changed to: TC = $6,000 + $0.5Q What is the break-even level of output? What is the level of profits at sales of 9,000 units