Artur Stett, Ltd. has three factories . A and Z. It supplies goods to four dealers spread all over the country. The production capacities of these factories are 200, 500 and 300 per month respectively. Factory Dealer Capacity A B C D Supply X 12 18 6 25 200 8 7 10 18 500 Z 14 3 11 20 300 Demand 180 320 100 400 Determine the minimum cost of transportation scheme