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 $29,630 in fixed costs to the $279,880 currently spent. In addition, Mary is proposing that a 5% price decrease ($40 to $38) will produce a 19% increase in sales volume (21,560 to 25,656). Variable costs will remain at $24 per pair of shoes. Management is impressed with Mary