Question: A logistics specialist for Wiethoff Inc. must distribute cases of parts from 3 factories to 3 assembly plants. The monthly supplies and demands, along with the per-case transportation costs are:

Destination Assembly Plant

1 2 3 Supply

Source A 5 9 16 200

Factory B 1 2 6 400

C 2 8 7 200

Demand 120 620 60

What are the supply constraints for the factories?