Harbor Manufacturing includes warranties on all of its products sold. Harbor's warranty liability was $10,000 on january 1. During the year, Harbor made repairs under warranty of $12,000 had sales revenue of $750,000. If Harbor estimates that warranty costs are 2% of sales, what is the balance in the warranty iliability account at December 31? $10,000 O $12,000 $13,000 O$15,000