Consider the transportation table below. The solution displayed was obtained by performing some iterations of the transportation method

$\backslash$table$[[$Source$,$Destination,Capacity$],[1,2,3],[$A$,,$$$30,,$$$30,$$$5,35],[,25,,,10,20],[$B$,,$$$10,$$$10,],[$C$,,$$$20,$$$10,$$$25,70],[$Demand$,,],[,25,60,40,]]$

The total cost of the current solution provided $=2150$ dollars.

Using stepping stone method, to perform an improvement iteration, the improvement index for the unused cell will be:

$A-2=$

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