In Table 5.4 of Example 5.1-2, where a dummy plant is added, what does the solution mean

Question:

In Table 5.4 of Example 5.1-2, where a dummy plant is added, what does the solution mean when the dummy plant “ships” 150 cars to Denver and 50 cars to Miami?

*5-4. In Table 5.5 of Example 5.1-2, where a dummy destination is added, suppose that the Detroit plant must ship out all its production. How can this restriction be implemented in the model?

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