Solve this transportation model by using the Northwest corner rule, then the minimum shipping cost is: * (2 Points) If the iPods are shipped at holiday to 4 distribution centers: N, demand 100, s, demand 140 , E, demand 300 and W, demand 250 from three facilities A, supply 200 , B, supply 350 and C, supply 150. The unit cost in Sper each unit of iPod is shown below. Destination Supply Source S N 16 E 22 w 17 13 200 14 13 19 15 B 350 9 20 23 10 c 150 Demand 100 140 300 250 10,770 $ and there is a surplus of W =90 10,860 $ and there is a surplus of W =90 10,860 $ and there is a shortage of W =90 10,770 $ and there is a shortage of W =90