Quantity Price MC 0 400 180 10 380 185 20 360 200 30 340 225 40 320 260 50 300 305 60 280 360 70 260 425 80 240 500 90 220 585 100 200 680 110 180 785 The above table shows the quantity demanded at varying prices and the corresponding marginal cost of production for a monopoly firm. Refer to the table above. What is the profit-maximizing output level? O 50 units O 40 units O 60 units O 30 units