a company sells its product subject to a warranty that covers the cost of parts for repairs during the six months after the date of the sale. warranty costs estimates to be 5% of sales. durng the month of july the company performed warranty work and used 11,000 of parts to perform the warranty work. sales for july were 450,000. record the warranty expense for the month of july.record the costs of the warranty work completed in june. if the the estimated warranty liability account had a credit balance of 10,000 on may 31, what is the account balance at june 30?