7. Two products are manufactured on two sequential machines. The following table gives the machining times in minutes per unit for the two products.

Machining time in min Machine 1

2 Product 1 5

6 Product 2 3

2

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The daily production quotas for the two products are 80 and 60 units, respectively. Each machine runs 8 hours a day. Overtime, though not desirable, may be used if necessary to meet the production quota. Formulate the problem as a goal programming model.