问题描述：
If UPS hires another worker,UPS will be able to deliver an additional 20 packages an
hour.The price of each package is $5.The value of this workerʹs marginal product is equal to ____.
A) $100.
B) $4.
C) $5.
D) 20 packages.
E) $20.
hour.The price of each package is $5.The value of this workerʹs marginal product is equal to ____.
A) $100.
B) $4.
C) $5.
D) 20 packages.
E) $20.
问题解答：
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