Staley Co. manufactures computer monitors. The following is a summary of its basic cost and revenue data: Assume that Staley Co. is currently selling 600 computer monitors per month and monthly fixed costs are $80,000. Staley Co.'s margin of safety ratio (MOS\%) if 600 units are sold would be (round intermediate calculation up to nearest whole number of units): 23.7%. 33.4%. 17.7%. 20.5%. 19.5%