Steel mills in three cities produce the following amounts of steel: These mills supply steel to four cities; where manufacturing plants have the following demand: Shipping costs per ton of steel are as follows: Because of a truckers' strike, shipments are prohibited from Bethlehem to St. Louis. You would like to determine how many tons of steel to transport from each steel mill to each manufacturing plants. Formulate this problem as a linear programming model and solve it using the computer. What is the total minimum cost at optimum? $8,440 $9,160 $9,490 59.540 None of the abave