ABC company supplies corn from three farms to three processing plants. The supply amounts at the three farms are 100, 200, and 50 thousand bushels; and the demands at the three plants are 150, 80, and 120 thousand bushels. Nodes 1, 2, and 3 are supply nodes, and nodes 4, 5, 6 are demand nodes. The objective is to find the flow assignment with the minimum cost to satisfy the demands