19. For a firm with Revenue = 20Q-2Q2 and Cost = 8Q, If marginal costs is found to exceed marginal revenue, then: a) The firm should increase its production level. b) The firm's average costs exceed average revenue. c) The firm should decrease its production level. d) The firm should shut down. 20. When Revenue = 20Q-2Q2 and Cost = 8Q, then the profit maximizing level output a) 3 is: b) 4.5. c) 8. d) 24.