Bozo's Froyo sells frozen yogurt in a competitive market, and the price of frozen yogurt is $4 per cup. If Bozo's Froyo employs another worker, its output rises from 160 to 172 cups of frozen yogurt per day. The value of the marginal product of labor at Bozo's Froyo is $4 per cup . 12 cups per 12 cups per worker . $48 per worker . $ 3 per worker