min
 1.080 x11 +1.095 x12 +1.110 x13 +1.125 x14 +0 x15
+1000 x21 +1.11 x22 +1.125 x23 +1.140 x24 +0 x25
+1000 x31 +1000 x32 +1.100 x33 +1.115 x34 +0 x35
+1000 x41 +1000 x42 +1000 x43 +1.130 x44 +0 x45
subject to
x11 +x12 +x13 +x14 +x15 = 25
x21 +x22 +x23 +x24 +x25 = 35
x31 +x32 +x33 +x34 +x35 = 30
x41 +x42 +x43 +x44 +x45 = 10
x11 +x21 +x31 +x41 = 10
x12 +x22 +x32 +x42 = 15
x13 +x23 +x33 +x43 = 25
x14 +x24 +x34 +x44 = 20
end
