求高人解英语数学题
Truckco manufactures two types of trucks, types 1 and 2. Each truck must go through the painting shop and the assembly shop. If the painting shop were completely devoted to painting type 1 trucks, 800 per day could be painted; whereas if the painting shop were completely devoted to painting type 2 trucks, 700 per day could be painted. If the assembly shop were completely devoted to assembling truck 1 engines, 1500 per day could be assembled, and if the assembly shop were completely devoted to assembling truck 2 engines, 1200 per day could be assembled. It is possible, however, to paint both types of trucks in the painting shop. Similarly, it is possible to assemble both types in the assembly shop. Each type 1 truck contributes $300 to profit; each type 2 truck contributes $500. According to the recent sales forecast, Truckco has to produce at least 200 type 1 trucks each day. The objective is to find a production plan that maximizes the daily profit. Formulate your model mathematically.