The widget industry has two types of firms. All Type A firms are identical and all Type B firms are identical. The following charts show the marginal cost curves at each type of firm and the demand curve for widgets:

The industry is in long-run equilibrium. Some of the firms in the industry are Type A and some are Type B. Type A firms have fixed costs of $120, and there are 10 Type A firms.
a. What are the fixed costs at a Type B firm?
b. How many Type B firms are there?
c. What quantity goes with a price of $100 on the industry's short-run supply curve?

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Type A Marginal Cost Type B Marginal Cost Quantity Marginal Cost (S) Quantity Marginal Cost (S) Price (S) Quantity Demand 20 40 60 80 100 60 80 100 120 140 20 40 60 80 100 120 140 80 70 60 50 40 30 20 4 4