15 Consider the project diagram in Figure 42. This project must be completed in 90 days. The time required to complete each activity can be reduced by up to five days at the costs given in Table 27.Formulate an LP whose solution will enable us to minimize the cost of completing the project in 90 days.

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TABLE 27 Cost of Reducing Activities Duration Activity by 1 Day ($) A 300 B 200 C 350 D 260 E 320