Based on the information given the marginal product of labor per hour from adding that third worker is $55 per hour.
Using this formula
Marginal product of labor per hour
=Change in sales/ Change in number of workers
Where:
Change in sales=($190 per hour-$135 per hour)
Change in number of workers=1
Let plug in the formula
Marginal product of labor=($190-$135)/1
Marginal product of labor=$55/1
Marginal product of labor =$55 per hour
Inconclusion the marginal product of labor per hour from adding that third worker is $55 per hour.
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