Business modeling optimization

Assignment:
Performance Lawn Equipment (PLE) produces mowers and tractors in several manufacturing facilities. Because of the popularity of their products, PLE have always sold their production and usually the number of mowers sold was at least twice the number of tractors sold. One of the PLE manufacturing facilities produces engine housing from sheet metal for both mowers and tractors.
Production of each product consists of five consecutive steps, which workers do in five departments: Stamping, Drilling, Assembly, Painting, and Packaging to ship products to the final assembly plant.