What is a normal profit and what is an economic profit

Question

The following questions address some of the price and output decisions faced by firms other than those found in perfect competition. Some numbers may be rounded.

Table 1

Output	Average Fixed cost	Average Variable Cost	Average Total Cost	Marginal Cost	Price	Total Revenue	Marginal Revenue
0					$ 345.00
1	$   180.00	$ 135.00	$    315.00		$ 300.00
2	$     90.00	$ 127.50	$    217.50		$ 249.00
3	$     60.00	$ 120.00	$    180.00		$ 213.00
4	$     45.00	$ 112.50	$    157.50		$ 189.00
5	$     36.00	$ 111.00	$    147.00		$ 165.00
6	$     30.00	$ 112.50	$    142.50		$ 144.00
7	$     25.71	$ 115.70	$    141.41		$ 126.00
8	$     22.50	$ 121.90	$    144.40		$ 111.00
9	$     20.00	$ 130.00	$    150.00		$   99.00
10	$     18.00	$ 139.50	$    157.50		$   87.00

Questions:

1. Summarize your calculations and use Microsoft Excel.
2. Using Excel, draw one graph showing average fixed costs, average variable costs, average total costs, marginal revenue, and marginal costs.
3. Using the data in the table and on your graph, what is the profit maximizing, or loss minimizing level of output?  Explain and justify your answers.
4. What is a normal profit?  What is an economic profit? Explain your answer using examples. Are normal profits being earned in this example? Are economic profits present for this firm in this example?  Explain your answers.
5. Given the data in the table and the graph, how could you determine or identify the optimal plant size?
6. What is the difference between explicit and implicit cost?  Explain your answers.
7.  How would we determine if a cost is a fixed cost or a variable cost?