Artisan Works is owned and operated by a craftsman who makes replicas of historic rearms for museums, sportsmen, and collectors. The data are as follows: Sales price per unit $800 Variable cost per unit 500 Fixed costs per month 10,200 If Artisan expects to sell 40 units per month, what is his margin of safety expressed in units per month? 0 A. 74 units 0 B. 4 units 0 C. 6 units 0 D. 40 units