21. A company has four salesmen who are to be assigned to four different sales territories. The monthly increases, estimated for each salesman in different territories (in lakh rupees), are shown in the table below:

Suggest optimal assignment for the salesmen. Which sales territory will remain unassigned? What will be the maximum sales increase every month?
If for certain reasons, salesman D cannot be assigned to territory III, will the optimal assignment schedule be different? If so, show the new assignment schedule/schedules

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Sales territories Salesmen I II III IV A 75 80 85 70 90 B 91 71 82 75 85 C 78 90 85 80 80 D 65 75 88 85 90