Ten cases of spring water are sold for $6 each, and the marginal product of the last unit of labor is 5 . If the price of a case increases from $6 to $8, then the marginal revenue product of the last unit of labor would
a. decrease by $10.
b. increase by $40.
c. decrease by $30.
d. increase by $10.
e. not change.
D
Economics
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