Let's assume, instead, that the roommate thing doesn't work out. Anthony now wants to consider other ways to increase his profit in this business. (c1) If he increases his selling price by 20% and maintains the same volume of four units per month, does it affect his DOL? (Round answer to 2 decimal places, e.g. 15.25.) Effect on DOL (c2) If so, what does this changed DOL mean for Anthony? Operating income by a change in sales.