23. A company manufactures three products: A, B, and C. The company currently has an order for 3 units of product A, 7 units of product B, and 4 units of product C. There is no inventory for any of these products. All three products require special processing that can be done on one of two machines. The cost of producing each product on each machine is summarized in the following table: Machine Cost of Producing a Unit of Product 1 2 A B $13 $11 $ 9 $10 $12 $ 8 The time required to produce each product on each machine is summarized in the following table: Time (Hours) Needed to Produce a Unit of Product Machine A B 1 0.4 1.1 0.9 2 0.5 1.2 1.3 Assume machine 1 can be used for eight hours and machine 2 can be used for six hours. Each machine must undergo a special setup operation to prepare it to pro- duce each product. After completing this setup for a product, any number of that product type can be produced. The setup costs for producing each product on each machine are summarized in the following table: Setup Costs for Producing Machine A B 1 $55 $93 $60 2 $65 $58 $75 a. Formulate an ILP model to determine how many units of each product to pro- duce on each machine in order to meet demand at a minimum cost. b. Implement your model in a spreadsheet and solve it. c. What is the optimal solution?