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 contribution to total revenue of the fourth worker hired is
A. $12 per hour.
B. $16 per hour.
C. $76 per hour.
D. $4 per hour.
Answer: B
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