Refer to the information provided in Table 8.6 below to answer the question(s) that follow.
Table 8.6
Refer to Table 8.6. The marginal cost of the fourth unit is ________ and the average total cost of four units is ________.
A. $15; $17.50
B. $10; $22.50
C. $5; $15
D. indeterminate from the given information
Answer: A
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