Xu TX,TX;] =4000 : 8000 + X33 = 7000 Area 1 Area 2 Area 3 Supply Refinery 1 6000 4000 2000 O Refinery 2 5000 5000 0 Refinery 3 8000 O 1000 7000 Demand 4000 8000 7000 Z = 12 x 4000 + 18 x 2000 + 30 x 0 + 10 x 5000 + 8 x 0 + 20 x 0 + 25 x 1000 + 12 x 7000 = 243 000