Set up and solve the problem on a spreadsheet. The minimum total shipping cost is?

This is Problem 3 in the textbook. A company has three manufacturing plants (in Atlanta, Tulsa, and Springfield) that produce a product that is then shipped to one of four distribution centers. The three plants can produce 13, 18, and 12 truckloads of product each week, respectively. Each distribution center needs 10 truckloads of product each week. The shipping costs per truckload between the plants and distribution centers are given in the table. The company needs to determine how much to ship from each plant to each distribution center and would like to minimize total shipping costs. Distribution Center Plant A B Atlanta $800 $1,300 $400 Tulsa $1,100 $1,400 $600 Springfield $600 $1,200 $800 D $700 $1,000 $900 Formulate an LP to minimize the total shipping costs.(No need to submit. You just keep your LP formulation on your notebook.) How many decision variables do you set up to work on this