Based on the market price, the quantity of labor, and the change in output, the marginal revenue product of the 30th unit of labor is $56.70.
First find the marginal product of labor as:
= (Change in units produced) / Change in labor quantity
= (190 - 105) / (30 - 15)
= 5.67 units
The market price is the price at which quantity demanded is equal to quantity supplied which is $10.
The marginal revenue product is:
= Marginal product of labor x Price
= 5.67 x 10
= $56.70
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