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 $24,210 in fixed costs to the $276,110 currently spent. In addition, Mary is proposing that a 5% price decrease ($41 to $39) will produce a 19% increase in sales volume (22,730 to 27,049). Variable costs will remain at $25 per pair of shoes. Management is impressed with Mary