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

	1		2		3		4		Capacity
A		4		6		8	8	40
	20		20
B		6		8		6	7	60
					50		10
C		5		7		6	8	50
			10				40
Demand	20		30		50		50		150

a. Perform one more iteration of the stepping-stone method on this problem. (10)

b. What is the total cost of the new shipping plan obtained (15)