Use the table below to answer the following question. 
What is the average total cost at an output level of four units?
Definitions:
Marginal Product
The additional output produced by using one more unit of a given input, holding all other inputs constant.
Marginal Cost Curve
A graphical representation that shows how the cost of producing one additional unit of a good changes as the production volume varies.
Short-Run Marginal Cost
The change in total cost associated with producing one additional unit of output, considering some inputs are fixed.
Embryonic Disk
A key structure in early embryonic development from which the embryo begins to form.
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