An assembly line can produce 90 units per hr. The line hrly cost is $4500 on stright line ( the first 8 hrs). Workers are guaranteed a minimum of 6 hrs. There is a 50% premiun for overtime (time and a half), how ever productivity drops by 5%. What are the average and marginal cost per unit for the following daily quantities.
a. 450
b. 600
c. 720
d. 900