7 There are three school districts in the town of Busville.

The number of black and white students in each district are shown in Table 70. The Supreme Court requires the schools in Busville to be racially balanced. Thus, each school must have exactly 300 students, and each school must have the same number of black students. The distances between districts are shown in Table 70.

Formulate a balanced transportation problem that can be used to determine the minimum total distance that students must be bused while still satisfying the Supreme Court’s requirements. Assume that a student who remains in his or her own district will not be bused.

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TABLE 68 Time (Minutes) Storage Medium Word Packaged Processing Program Data Hard disk 5 4 4 Memory Tape 20 1 1 10 8 6 TABLE 69 Distance (Blocks) Car Call 1 Call 2 Call 3 12345 10 11 18 6 7 7 7 5 9 8 64 4 547 *This problem is based on Evans (1984).