If fixed costs are $315,000, the unit selling price is $72, and the unit variable costs are $46, the old and new break-even sales (units), respectively, if the unit selling price increases by $6 are a. 4,375 units and 12,115 units b. 12,115 units and 9,844 units c. 6,848 units and 9,344 units d. 12,115 units and 4,375 units