Waterways packages some of its products into sets for home installations. One set's (small) unit selling price is $79 with unit variable costs of $49. Another set's (large) unit selling price is $153 with unit variable costs of $101. The parts for the $79 set take 10 machine hours to produce. The parts for the $153 set take 20 machine hours to produce. Given the information above, and assuming all of the package sets produced can be sold each month, illustrate the best use of machine hours. (Round answers to 2 decimal places, e.g. 5.25.)