If selling price is $12 per unit and variable cost per unit is $5 and profit is $20,000, what would be the margin of safety in units if sales are recorded 10,000 units? Select one: O a. 3,000.5646 O b. 4,000.2315 O c. 3,500.1323 O d. 2,857.1429 O e. None of the above