Table 30.1Number of workers (per hour)Total output (per hour)Marginal physical product (output per worker)Total revenue (dollars per hour)Marginal revenue product (dollars per hour worker)14---________---210________________________315________________________419________________________522________________________Assume that the product price is $4 per unit and that the hourly wage for workers is $12. Neither price nor wage changes with output. In Table 30.1, the marginal physical product of the third worker hired is
A. 15 units per hour.
B. 3 units per hour.
C. 4 units per hour.
D. 5 units per hour.
Answer: D
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