Casey's Cases sells cell phone cases in a mall kiosk. Casey charges $46 per case. The variable cost for a case, including the case, the royalty paid to the mall, and so on is $34. The monthly fixed cost for Casey's Cases is $3,420 Required a. How many cases must Casey sell every month to break even? Break-even point cases b. Casey believes that he can sell 345 cases a month. What is the margin of safety in terms of the number of cases? Margin of safety cases