Consider the transportation problem and its optimal solution in the tables below. The cell Source 3 - Destination 3 is currently empty. What would be the change in the total shipping cost if the largest possible amount were shipped using that route, leaving all the supply and demand conditions unchanged? Dest. 1 Dest. 3 Dest. 2 18 COSTS Source 1 Source 2 Source 3 Demand 30 14 Dest. 4 Supply 11 105 15145 16 50 90 3001 300 10 60 70 Dest. 1 Dest. 2 Dest 3 Dest. 4 Row Total 5 105 Shipments Source 1 Source 2 Source 3 Col. Total 85 145 90 300 1300 00 O fifty units O a decrease of $9 o an increase of $630 O an increase of $450