please show step by step, using mixed integer program to determine the minimum cost schedule

20 units cost $9 per unit. Formulate a mixed integer program to determine the minimum 2. Abaso Company manufactures products A, B, and C. Each unit of product (A, B, C) pounds of material. There are 100 hours of engineering, 700 hours of labor, and 400 requires (1, 2, 1) hour of engineering service, (10, 4, 5) hours of direct labor, and (3, 2, 1) pounds of material available. The production cost is a non-linear function of the following Note that if 60 units of A are made, the first 40 units cost $10 per unit and the remaining quantities produced as shown below: Product A Product B Quantity Unit cost Quantity 0-40 $10 0-50 41-100 9 51-100 101-150 8 Over 100 Over 150 Unit cost Product C Quantity 0-100 6 4 3 Unit cost 5 4 over 100 7 C must be met