Given the following information set up the problem in a transportation table and solve for the minimum$-$cost plan:

$\backslash$table$[[,$PERIOD$],[$Demand$,1,2,3],[$Capacity$,550,700,750],[$Regular$,500,500,440],[$Overtime$,50,50,50],[,$ Subcontract,$120,120,100],[$Beginning inventory,$100,,],[$Costs$,$$$60$ per unit,,$],[$Regular time,$$80$ per unit,,$],[$Overtime$,$$$90$ per unit,,$],[$Subcontract$,$$$1$ per unit per month,,$],[$Inventory carrying cost,$$3$ per unit per month,,$],[$Back$-$order cost,,,$]]$

Suppose the inventory carrying cost has just increased and is now $$2$ per unit per period. Compute the total cost for the original transportation model with $$1$ inventory carrying cost, and the new total cost at $$2$ carrying cost. What is the additional cost for the optimal plan?

Additional cost