18 Monsanto annually produces 359 million lb of the chemical maleic anhydride. A total of four reactors are available to produce maleic anhydride. Each reactor can be run on one of three settings. The cost (in thousands of dollars) and pounds produced (in millions) annually for each reactor and each setting are given in Table 99. A reactor can only be run on one setting for the entire year. Set up an IP whose solution will tell Monsanto the minimum-cost method to meet its annual demand for maleic anhydride.

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TABLE 99 Reactor Setting Cost ($ Thousands) Pounds 2223 1 2 2 1231231 50 80 80 140 100 170 65 100 90 140 120 215 70 112 3 2 90 153 3 4 4 4 3123 110 195 40 65 2 60 105 3 70 130