9. Monsanto annually produces 359 million lb of the chemical malefic anhydride. A total of four reactors are available to produce malefic 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 the Table below. 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 malefic anhydride.

Reactor Setting Cost($) Pounds

1 1 50 80

1 2 80 140

1 3 100 170

2 1 65 100

2 2 90 140

2 3 120 215

3 1 70 112

3 2 90 153

3 3 110 195

4 1 40 65

4 2 60 105

4 3 70 130

Reactor Setting Cost($) Pounds

1 1 50 80

1 2 80 140

1 3 100 170

2 1 65 100

2 2 90 140

2 3 120 215

3 1 70 112

3 2 90 153

3 3 110 195

4 1 40 65

4 2 60 105

4 3 70 130

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