20 - A

21 - B

please explain how I find 22

Questions 20, 21 and 22 refer to the figure below which shows the price, marginal cost, and average cost curves facing a perfectly competitive firm in the short run. MC Cost, price (Rand) 20 12 8 80 100 Q 60 Output per day 20. What is the firm's profit-maximising output in the short run? A. 100 units B. 140 units C. 80 units D. 60 units E. No output should be produced 21. What is the total revenue of the profit-maximising firm in the short run? A. R800 B. R2 000 C. R960 D. R720 R600 22. Total costs to the profit-maximising firm in the short run are A. R960. B. R1200. C. greater than R1200. D. R720. E. smaller than R640