Example-Continued X;=amount to buy from supplierj C=amount of ingredient i required per ton of product manufactured a=amount of ingredient i in each ton from supplier j Supplier 1 Supplier 2 Supplier 3 (lb/ton) (lb/ton) (Ib/ton) Manganese 1 3 2 Silicon 2 4 3 Copper 3 4 7 华南师范大学数学科学学院谢骊玲 Example - Continued ◼ Xj = amount to buy from supplier j ◼ Ci = amount of ingredient i required per ton of product manufactured ◼ aij = amount of ingredient i in each ton from supplier j Supplier 1 (lb/ton) Supplier 2 (lb/ton) Supplier 3 (lb/ton) Manganese 1 3 2 Silicon 2 4 3 Copper 3 4 7 华南师范大学数学科学学院 谢骊玲