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Solve the following assignment problem

Solve the following assignment problem (Profits in ‘000 Rs)

Jobs     Machines    
  M1 M2 M3 M4 M5
J1 12 14 13 14 15
J2 14 13 12 - 17
J3 18 16 15 13 17
J4 10 10 - 16 12
J5 16 15 14 22 13
1 Answer
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The hyphens indicate that there is zero profit in those cells.

Converting the problem to a minimization problem, by considering the difference between the largest element in the whole matrix, and each other element:

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  • Subtracting the smallest element from each row, from all the other row elements:

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  • Subtracting the smallest element from each row, from all the other row elements:

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Allocation can be made as shown. However, each row and column do not have one allocation. Drawing minimum number of lines through the zeroes:

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  • Subtracting the minimum uncovered element from all the other uncovered elements, and adding it to the elements where 2 lines intersect:

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Allocation can be made as shown. However, each row and column still do not have one allocation. Drawing minimum number of lines through the zeroes:

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  • Subtracting the minimum uncovered element from all the other uncovered elements, and adding it to the elements where 2 lines intersect:

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Every row and column has an allocation.

Making the same allocation in the original matrix:

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Maximum profit = 18 + 10 + 13 + 22 + 17 = Rs. 80000

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