During the year, Great Adventures sold 150 dune buggies for $4,000 each. The dune buggies carry a 5-year warranty for defects. Estimates suggest that repair costs will average 4% of the total selling price. The estimated warranty liability at the beginning of the year was $14,000, and $20,000 in claims was actually incurred during the year to honor the warranty. What was the warranty expense at the end of the year? Ca. $10,000 Ob. $18,000 Oc. $24,000 Cd. $20,000