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Ores are mined and processed at the mines A, B, C and D with the following capacities: Capacity Mines (tons) A 90 B 50 C 80 D 60 Total 280 These mines supply the following amount of ores to refinery plants in three cities: Demand City (tons) 1 120 2 100 3 110 Total 330 The railroad shipping cost (in thousand pesos) per ton are shown below. To From 1 2 3 A 7 10 5 B 12 9 4 C 7 3 11 D 9 5 7 Find the optimal solution using Microsoft Excel