7. MC is looking for a location for a distribution center that provides the computers to three new retail outlets. The location of the outlets and the quantity handled at each are provided in the table below. Assuming freight rates for all outlets are the same (= 1), find the location of the distribution center by the gravity model. Show the total distribution cost at each iteration, and iterate the algorithm until the change in the total cost becomes less than 1%. Retail 1 2 3 60 40 20 20 60 20 100 300 200