If fixed costs are $289,000, the unit selling price is $70, and the unit variable costs are $46, what are the old and new break-even sales in units (rounded to a whole number) if the unit selling price increases by $6? a. 6,283 units and 9,133 units b. 4,129 units and 12,042 units c. 12,042 units and 9,633 units d. 12,042 units and 4,129 units