Final answer:
The marginal product per dollar spent on the last unit of labor is 0.3 dresses per dollar.
Step-by-step explanation:
The marginal product per dollar spent on the last unit of labor can be calculated by dividing the increase in output by the cost of hiring the labor. In this case, the last unit of labor hired cost $1,000 per month and increased output by 300 dresses. Therefore, the marginal product per dollar spent on labor is:
Marginal product per dollar spent on labor = Increase in output / Cost of labor
= 300 dresses / $1,000
= 0.3 dresses per dollar
So, the marginal product per dollar spent on the last unit of labor is 0.3 dresses per dollar.