Use the following graph to answer the following questions. 
a. If the wage rate and the rental price of machines are both $50 and total cost is $800, is the cost-minimizing point A, B, or C?
b. If the wage rate is $40, the rental price of equipment is $120, and total cost is $1,200, is the cost-minimizing point A, B, or C?
c. If the wage rate is $60, the rental price of equipment is $90, and total cost is $1,800, is the cost-minimizing point A, B, or C?
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