Staley CoManufactures Computer Monitors

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 if 600 units are sold,is calculated to be:

A) 33.4%.
B) 17.7%.
C) 20.5%.
D) 19.5%.
E) 79.5%.