1. The demand curve is flat and it is equal to the marginal / average revenue, thus this industry is most likely represents perfect competition.
2. In case of perfect competition the firm maximizes profit at the point where MC = P. As we can see from the graph the point where marginal cost intersects the demand curve the average total cost is less than the price. Refer graph where MC = D price is $ 28 and quantity is 200 units at this quantity only ATC = $ 22. Thus the firm is maximizing economic profit.
3. Profit = Total Revenue - Total Cost
Profit = PQ - Q×ATC
Profit = 28 × 200 - 200×22
Profit = 5600 - 4400
Profit = $ 1,200
First option is correct. Profit of $ 1,200
4. In the given diagram the demand curve is downward sloping and the marginal revenue curve is in the shape of a wedge with the demand curve.

Hence, it represents all market structure except perfect competition.
5. The firm is maximizing profit as the firm is selling at a price that is greater than it's Average Total Cost. Hence it is earning a normal profit.
6. Profit = 24×117 - 20×117 = 2,808 - 2340
Profit = $ 468
Profit of $ 468.
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