A plastic manufacturer has 1200 boxes of transparent wrap in stock at one factory and 1000 boxes at his second factory.The manufacturer has order for this product from 3 different retailers,a quantities of 1000,700,500 boxes respectively.The unit shipping cost from the factories to the retailers are as follow: F1= 14,13,11; F2= 13,13,12. Determine a minimum cost of shipping schedule satisfying all the demand from current inventory.