Now suppose that the Canadian origin $($Toronto$)$ can serve only the Canadian destination $($Montreal$).($Now Toronto serves Montreal and nowhere else.$)$ How much does this restriction increase the cost from the original cost in #$1$a$?$

a$.$ Minimum cost $=\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$

b$.\%$ increase over cost from #$1$a$.=\_\_\_\_\_\_\_\_\_\_\_\_\_\_$

c$.$ Fill in the table below with the optimal product flows in the red box, the flow out of each origin in the rowsum column, and the flow into each destination in the colsum row.

flows Atlanta Boston Denver Miami Montreal Seattle Supply rowsum

Chicago $600$

Dallas $400$

San Diego $600$

Toronto $600$

Demand $150200200400300300$

colsum