Shock Company manufactures computer monitors. The following is a summary of its basic cost and revenue data: Assume that Shock Company is currently selling 600 computer monitors per month and monthly fixed costs are $80,000. What is Shock Company's margin of safety (MOS), in units, if 600 units are sold and all costs and revenues are as budgeted? (Round intermediate calculation up to nearest whole number of units.) 214. 242. 128. 123. 141