2.12 The estimated short-run cost function of a Japanese beer manufacturer is C(q) = 0.55q1.67 + 800/q (see the Application “Short-Run Cost Curves for a Japanese Beer Manufacturer”). At what positive quantity does the average cost function reach its minimum?

If a $400 lump-sum tax is applied to the firm, at what positive quantity is the after-tax average cost minimized? M L-9687