Market demand is given as QD = 100 – 2P. Market supply is given as QS = P + 10. In a perfectly competitive equilibrium, what will be the value of consumer surplus?

Output (unit) Total cost (RM) Total fixed cost (RM) Total variable cost (RM) Average fixed cost (RM) Average variable cost (RM) Average total cost (RM) Marginal cost (RM) 0 600 600 - - - - - 10 1050 600 450 60 45 105 45 20 1450 600 850 30 42.5 72.5 40 30 1800 600 1200 20 40 60 35 40 2100 600 1500 15 37.5 52.5 30 50 2450 600 1850 12 37 49 350 60 2850 600 2250 10 37.5 47.5 40 70 3300 600 2700 8.57 38.57 47.14 45 80 3850 600 3250 7.5 40.625 48.125 55 90 4500 600 3900 6.67 43.34 50 65 100 5250 600 4650 6 46.5 52.5 75 Which time period is the firm operating? Why?

What is the relationship between marginal cost (MC) curves and average cost (AC) curves? You may use a graph help you illustrate whenever necessary.

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