The standard models contribute $$20$ each and the deluxe $$30$ each to profits. Because the company produces other items that share resources used to make the dishwashers, the stamping machine is available only $30$ minutes per hour, on average. The motor installation production line has $60$ minutes available each hour. I here are two lines for wiring, so the time availability is $90$ minutes per hour.

The company wants to know the number of standard dishwashers deluxe dishwashers that should be produced per hour in order to maximize profits.