Use this problem to answer questions 24 28 Every month, Sigma Corporation of America needs to ship its lenses from its warehouse in Birmingham to four cities, Atlanta, Knoxville, Charlotte and Virginia Beach through the network below The unit shipping costs (in $) for each lens between cities are given next to each arc The shipping route may pass by some transshipment cities, Lynchburg, Raleigh, Greenville, Greensboro, Asheville and Chattanooga The monthly supply in Birmingham is 5000 and the monthly demands of lenses are given in the table below

Question: Use this problem to answer questions 24 - 28 Every month, Sigma Corporation of America needs to ship its lenses from its warehouse in Birmingham