Ra'ad Equipment Company sells computers for 1,500 each and also gives each customer a 2year warranty that requires the company to perform periodic services and to replace defective parts. During 2018 , the company sold 740 computers. Based on past experience, the company has estimated the total 2-year warranty costs as 30 for parts and 60 for labor. (Assume sales all occur at December 31, 2018.) In 2019, Ra'ad incurred actual warranty costs relative to 2018 computer sales of 10,000 for .parts and $18,000 for labor Instructions Under an assurance-type warranty, what is the balance of warranty expense, warranty liability at the end of 2018 and 2019. (6 marks)