4. Hart Company sold 5,000 units last period for a price of $50 per unit and had the following additional information from last period: Total variable costs Break-even point Total Fixed Costs $160,000 $347,222 $125,000 How many units must be sold to earn $28,000 operating profit? A) 4,788 units. B) 8,500 units. C) 6,945 units. D) 1,555 units. E) None of the above