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To 1 2 3 4 Supply From 40 A B $5 4 7 $5 2 8 $7 3 4 $6 5 70 40 Demand 30 20 30 40 Derive initial solutions by the northwest corner method, minimum-cell-cost method, and VAM. Indicate total transportation costs. To A B C Supply From 1 2 3 $50 65 40 $75 80 70 $30 40 50 $45 60 55 120 170 110 Demand 100 100 100 100 a. Determine an initial solution by VAM. b. Using an initial solution by VAM, find the optimum solution using the MODI method