please explain each step.

2. A company has factories at A, B and C which supply warehouses at D, E and F. Weekly factory capacities are 200, 160 and 90 units respectively. Weekly warehouse requirements (demands) are 180, 120 and 150 units respectively. Unit shipping costs are as follows: Factory A B C Demand D 16 14 26 180 E F 2012 8 18 24 16 120 150 Capacity 200 160 90 450 Determine the optimum distribution for this company to minimize shipping costs