[1] [0] 13 1 The Cij values (costs per unit flow) are given by the arcs, and all Uij = . Starting the initial BF solution that corresponds to replacing the tractor every year, use the network simplex method to solve this problem. Display your work clearly by identifying entering basic arc, leaving basic arc, the next BF solution for each iteration. 48 28 33 3 2 [-1] 20 20 [0] 17