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Instructions
There are 6 refineries, 7 depots and 9 districts. The refineries are BB, BC, BD, BE, BF and BG. The depots are AA, AB, AC, AD, AE, AF and AG. The districts are AAA, AAB, AAC, AAD, AAE, AAF, AAG, AAH, and AAI. Table A gives the cost of transporting one unit from refinery to depot. Table B gives the cost of transporting one unit from depot to a district.
Solution
Route for  least cost of sending one unit from refinery BB to any district, would be first from BB to AB and then from AB to AAC.
Hence total cost 311.8 + 0 = 311.8Â
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