National Appliance Center sells washing machines that carry a three-year warranty against manufacturer's defects. Based on company experience, warranty costs are estimated at $60 per machine. During the year, National sold 48,000 washing machines and paid warranty costs of $340,000. In its income statement for the year ended December 31, National should report warranty expense of
a. $680,000.
b. $960,000.
c. $2,200,000.
d. $2,880,000.