Panther Co. had a quality-assurance warranty liability of $350,000 at the beginning of 2021 and $310,000 at the end of 2021. Warranty expense is based on 4% of sales, which were $50 million for the year. What amount of warranty costs were paid during 2021?
a. $0.
b. $1,960,000.
c. $2,000,000.
d. $2,040,000.