Calculations needed please

Consider the following table of long-run total cost for three different firms: Quantity of Output Firm A Firm B Firm C 60 11 21 70 24 34 80 39 49 90 56 66 100 75 85 6 110 96 106 120 119 129 Does each of these firms experience economies of scale and/or diseconomies of scale? Show your calculations. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BIUS Paragraph Arial 14px IN - v A v v T.Question 3 The following table represents a monopolist firm. Quantity Price Total Revenue Average Revenue (Dinar) Marginal Revenue 1 50 2 90 D F 3 40 4 B 20 5 30 E 6 150 7 20 C 8 A -20 9 90 -30 10 5 G Find A, B, C, D, E, F and G in the table. If this firm's marginal cost is fixed and equal to 10, how much units should it produce to maximize its profit? Why? For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac) BIUS Paragraph Arial 14px E v Av & v TX A) 15 B) 140 C) 140 D) 45 E) 30 F) 40 G) -40 The firm should produce 5 units when MR = MC = 10