Mary Willis is the advertising manager for Bargain Shoe Store. She is currently working on a major promotional campaign. Her ideas include the installation of a new lighting system and increased display space that will add $32,400in fixed costs to the $417,000currently spent. In addition, Mary is proposing that a 5% price decrease ($60to $57) will produce a20% increase in sales volume (20,000to24,000). Variable costs will remain at $36per pair of shoes. Management is impressed with Marys ideas but concerned about the effects that these changes will have on the break-even point and the margin of safety.