As hiring another worker will decrease the average production to 98 bushels of wheat, the marginal product of the 31st worker is 38 bushels of wheat.
The marginal product of labor is the change of output generated by hiring 1 unit labor.
It can be expressed as:
MPL = (Q2 - Q1) / (L2 - L1)
Where:
Q = total production
L = number of workers
Data from the problem:
Q1 = 30 x 100 = 3000 bushels of wheat
L1 = 30 workers
Q2 = 31 x 98 = 3038 bushels of wheat
L2 = 31
Plug these parameters into the formula:
MPL = (3038 - 3000) / (31 - 30) = 38
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