Assume that Sallisaw Sideboards, Inc. had a retained earnings balance of $10,000 on April 1, and that the company had the following transactions during April. Issued common stock for cash, $5,000. Provided services to customers on account, $2,000. Provided services to customers in exchange for cash, $900. Purchased equipment and paid cash, $4,300. Paid April rent, $800. Paid employees' salaries for April, $700. What was Sallisaw's retained earnings balance at the end of April