Solve the following transportation problem:

Is the optimal solution obtained by you a unique one? If not, why? What are the alternate optima then?

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Destination Source Supply 1 2 3 4 1 2 15 3 553 15 18 19 13 16 896 22 16 30 20 14 40 23 17 30 Demand 20 20 20 25 35 100