12. The following table gives one of the possible solutions to a transportation probelm involving three sources and four destinations:

(i) Is the above solution degenerate?
(ii) Is the above solution optimal? Is it a unique solution? If yes, why?
(iii) What is the opportunity cost of transporting one unit from source S 1 to destination D4?
(iv) How would the cost be affected if it is decided to transport one unit from S2 to D2?

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D D2 D3 D4 200 100 6 18 23 5 S 10 150 4 50 13 10 50 350 $3 7 13 15 5