The starting solution using northwest-corner method is: (Note: You must enter a shipment in every cell, even if the shipment is 0 .) a) The total cost of the initial solution developed using the northwest-corner method = $ The starting solution using the intuitive lowest-cost method is: INote: You must enter a shioment in every cell, even if the shipment is b) The total cost of the initial solution developed using the intuitive lowest-cost method =$ c) The total cost of the optimal solutian =$