A total of 30,000 units were sold last year. The contribution margin per unit was $2, and total fixed expenses were $20,000 for the year. This year, fixed expenses are expected to increase to $26,000, but the contribution margin per unit will remain unchanged at $2. How many units must be sold this year to earn the same operating income as was earned last year?

23,000 units.

33,000 units.

30,000 units.

13,000 units.