After one iteration of the stepping-stone method, Johnson Consumer Inc. produced the following transportation table:

From/To	Warehouse 1	Warehouse 2	Warehouse 3	Capacity
Factory A	$8	$5	$6	120
Factory B	$15	$10	$14	80
Factory C	$3	$9	$10	80
Requirements	150	80	50

After the initial iteration the results of the shipping pattern were as follows:

From/To	Warehouse 1	Warehouse 2	Warehouse 3	Capacity
Factory A	120			120
Factory B		80		80
Factory C	30		50	80
Requirements	150	80	50

a. Based on the tables above, what is the cost?

ans: "$2,350"

b. Based on the optional solution (stepping stone method), what is the cost?

Ans: $1,900

c. If the requirement at Warehouse 3 increased by 25 units, what is the optimal solution?

Options: ["$1,850", "$1,945", "$1,800", "$1,900"]

Are all of the warehouse requirements met?

Options: ["no", "the problem is balanced", "cannot determine", "yes"]

If so/not, which warehouse is backlogged/not, and by how much or not?

Options: ["warehouse 3 by 50", "warehouse 1 by 25", "warehouse 3 by 25", "all requirements are met - the problem is balanced"]

d. Based on your solution in letter b., you now need to ship 40 units from Factory A to Warehouse B. What is the optimal solution?

Options: ["$1,850", "$1,900", "$2,250", "$1,980"]

I already got A and B, can you help on C and D?