Two types of chemicals are produced in a factory (A and B). These substances go through two different production processes. The first production process requires 2 hours of labor and 1 unit of raw material, and the result of the 1st production process results in 2 units of A and 1 unit of B material. For the second production process, 3 hours of labor and 2 units of raw materials are required, and as a result of the 2nd production process, 3 units of A and 2 units of B are produced. The company has 60 working hours and 40 units of raw material resources. Although the demand for item A is unlimited, there is a maximum of 20 unit requests for item B. The selling price of item A is 16 TL per unit, and the selling price of item B is 14 TL per unit. Recycling is mandatory for every unit of item B which is not sold, and the cost of recycling is 2 TL per unit. Develop the linear decision model that will maximize the company's revenue (verbally define the decision variables you will use in your model).