1. A company has two production lines that produce three different silver products "plate", spoon", "fork". - During each hour of operation: -Line 1 produces 60 plates, 20 spoons and 40 forks. - Line 2 produces 20 plates, 20 spoons and 80 forks. It costs $200 / hour to operate line 1 and $160 /hour to operate line 2 To fulfill its contractual obligations the company needs to produce at least 120 plates, 80 spoons, and 240 forks. How many hours per day should each line be operated in order to supply the demand in the least costly way