Kosman's Catering balance sheet on August 31, 20X9, has total assets of $73,000, total liabilities of $20,000, paid-in capital of $30,000, and retained earnings of $23,000. During the month of September, Kosman's Catering recognized revenues of $73,000, cost of goods sold of $47,000, depreciation expense of $12,000, the payment of October and November's rent totaling $2,500, and salary expense of $8,000. The retained earnings balance at September 30, 20X9, will be