If fixed costs are $329,000, the unit selling price is $75, and the unit variable costs are $45, the old and new break-even sales (units), respectively, if the unit selling price increases by $7 are O a. 7311 units and 8 392 units Ob. 10,967 units and 8.892 units Oc 10,967 units 4,387 units d. 4,387 und 10,967 units