Answer:
125 birdhouses per month
Explanation:
Barney=150 birdhouses
Total product=150 birdhouses
If Barney hires Fred
Fred =125 birdhouses
Total product=150+125
=275 birdhouses
Marginal product can be defined as a change in output as a result of a change in variable inputs
It can be calculated as follows
Marginal product=change in total product/change in variable inputs
=275-150/1
=125/1
=125 birdhouses per month