Given the following transportation problem:

It is known that currently nothing can be sent from warehouse 1 to market A and from warehouse 3 to market C. Solve the problem and determine the least cost transportation schedule. Is the optimal solution obtained by you unique? If not, what is/are the other optimal solution/s?

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Market Warehouse Supply A B 1 10 12 7 180 2 14 11 6 100 3 9 5 13 160 4 11 7 9 120 Demand 240 200 220