In 2015, for the first time, Harman Manufacturing Company sells, 10,000 washers and dryers at an average price of $600. The selling price includes a one-year warranty. Based on past experience, it is expected that 500 units (5%) will be defective, and that warranty repair costs will average $100 per unit. During 2015, warranty contracts are honoured on 300 units at a total cost of $30,000, composed of $20,000 of wages and $10,000 of repair parts. Prepare the year-end adjusting entry to a) record warranty expense for 2015, and b) to summarize the repair costs incurred during the year to honour warranty costs on the washers and dryers sold during the year.