1. An electronics firm produces three types of switching devices. Each type involves a two step assembly operation. The assembly times are shown in the following table: Assembly time per unit (minutes) Station 1 Station 2 Model A 2.5 3.0 Model B 1.8 1.6 Model C 20 2.2 7.5hr 7.5hr Each workstation has a daily working time of 7.5 hrs. The manager want to obtain the greatest possible profit during the next five working days. Model A yields a profit of br. 8.25 per unit, Model B a profit of br 7.5 per unit and model C a profit of Br 7.8 per unit Assume that the firm can sell all it produces. During this time, but it must fill outstanding orders for 20 units of each model type. Required Formulate the linear programming model of this problem.​