JoShop uses lathes and drill presses to produce four types of machine parts, PP1, PP2, PP3, and PP4. The following table summarizes the pertinent data:

Machining time in minutes per unit of Machine PP1 PP2 PP3 PP4 Capacity (min)

Lathes 2 5 3 4 5300 Drill presses 3 4 6 4 5300 Unit revenue ($) 3 6 5 4 For the parts that are not produced by the present optimum solution, determine the rate of deterioration in the optimum revenue per unit increase of each of these products.