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

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