Mr Johnson has a store where he assembles and sells X-Boxes and Playstations. His factory is able to assemble 250 X-Boxes and 150 Playstations in one month. In order to stay in business each month his store must sell at least 20 X-Boxes and 50 Playstations. It costs $500 to buy the parts and assemble each X-Box and $750 for each Playstation. This month Mr Johnson only had $160,000 for materials and labor. Each X-Box makes $100 and each Playstation $225 in profit. How many of each should he sell to maximize his profit?​