Problem 18 Question Help The Thor International Company operates four factories that ship products to five warehouses. The shipping costs, requirements, and capacities are shown in the tableau below. Use the transportation method to find the shipping schedule that minimizes shipping cost. Factory Shipping Cost per Case to each Warehouse W2 W3 W4 W5 $2 $3 $4 $5 Capacity W1 $2 Dummy $0 F1 55,000 $2 $3 $3 $4 $6 SO F2 80,000 $2 $3 $3 $2 $4 $0 F3 80,000 $5 $3 $4 $5 $2 F4 $0 40,000 Demand 45,000 35,000 30,000 35,000 50,000 60,000 255,000 The minimum shipping cost is $. (Enter your response as a whole number)