A total of 30,000 units were sold last year. The contribution margin per unit was $2, and fixed expenses totaled $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 net income as was earned last year?
a. 23,000
b. 33,000
c. 30,000
d. 13,000