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The next 3 questions refer to the following: The capital stock is fixed at 6 units, the price of capital is $70 per unit, and the price of labour is $35 per unit. Labour Output 0 0 3 10 6 26 9 46 12 60 15 72 18 80 21 86 If the firm produces 80 units of output, its Total Cost of production is $ If the firm produces 60 units of output, its Average Variable Cost is $ The 76th unit of output adds $ to the firm's Total Variable Cost