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

Destination
Source 11 22 33 Capacity
Upper AA $30 $30 $5 35
25 10
Upper BB $10 $10 $10 20
20
Upper CC $20 $10 $25 70
40 30
Demand 25 60 40
The total cost of the current solution provided = dollars.

Using the stepping stone method, to perform an improvement iteration, the improvement index for the unused cell will be:
A-2 =
B-1=
B-3=
C-1=

Based on the improvement index for each of the unused cells, in the first improvement iteration, unused cell HoustonminusMiami should get an assignment of 20 units. The improved transportation flow will be.
(Note: You must enter a shipment in every cell, even if the shipment is 0.)