Consider the transportation table below.

(a) Find the initial solution by using the northwest corner method.

(b) What is the total cost of the shipping plan that is obtained by performing two iterations of the stepping stone method? Show all of your work

(c) Find the optimum solution by using an Excel solver. provide a managerial insight for your findings.

The cost of shipping a unit per mile
From\To	W	Z	X
A	$4	$6	$4
B	$7	$8	$3
C	$3	$4	$5

Supplier	capacity		Customer	Demand
A	50		W	90
B	45		Z	60
C	75		X	70