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 $29,540 in fixed costs to the $279,770 currently spent. In addition, Mary is proposing that a 5% price decrease ($44 to $42) will produce a 19% increase in sales volume (20,450 to 24,336). Variable costs will remain at $28 per pair of shoes. Management is impressed with Mary