4. A company that operates 10 hours a day manufactures three products on three sequential processes. The following table summarizes the data of the problem:

Minutes per unit Product Process 1 Process 2 Process 3 Unit price 1 10 6 8 $4.50 2 5 8 10 $5.00 3 6 9 12 $4.00

(a) Determine the optimal product mix.

(b) Use the dual prices to prioritize the three processes for possible expansion.

(c) If additional production hours can be allocated, what would be a fair cost per additional hour for each process?

s.
*6.