There are three power generation units in one location: unit 1, unit 2, and unit 3. Power capacity, production, kW per ton coal, and production cost per kW each unit are shown in the table below. There is 12000 ton of coal available in coal yard per day : Coal consumption, kW per ton Production capacity, kW Cost production per kW, $ Unit 1 2 1000 3 Unit 2 3 900 2.5 Unit 3 2 1100 2 Due to differences in specifications per unit, there are some rules must be considered. Minimum electricity that must be generated in unit 1 = 750 kW, Unit 2 = 650 kW, Unit 3 = 700 kW. Load demand, which must be fulfilled, is 1250kW per day. Determine, 1. Identify the decision variables 2. Write the objective function 3. Mention the constraints