At its December 31 year-end, a company estimates its bad debts as 0.40% of its annual credit sales of $991,000. The company records its bad debts expense for that estimate. On the following June 1, the company decides that the $496 account of a customer is uncollectible and writes it off as a bad debt. On July 21, the customer unexpectedly pays the amount previously written off. Prepare the company's journal entries to record the transactions of December 31, June 1, and July 21