Suppose there is a supply chain network. The demand$/$supply$,$ transportation capacity

and cost are listed in below table. Demand$/$supply is shown with city name. Transportation

capacity and cost are shown in the cell. For example, from New York to Boston, the transportation

capacity is $100,$ the cost per unit is $$30.$

draw transportation network using table information.

find minimal total cost of operations. If there is no minimal cost existed, pls explain the reason.