Brief Exercise 4-4 The ledger of Rios Company contains the following balances: Retained Earnings $30,000; Dividends $1,000; Service Revenue $50,000; Salaries and Wages Expense $28,000; and Supplies Expense $7,000. Prepare the closing entries at December 31. (Credit account titles are automatically indented when amount is entered. Do not indent manually.) Debit Credit Date Account Titles and Explanation Dec. 31 Service Revenue 50,000 50,000 Income Summary (To close revenue account) Dec. 31 Income Summary Salaries and Wages Expen: Supplies Expense (To close expense accounts) Dec. 31 Income Summary Retained Earnings (To close net income (loss)) Dec. 31 Dividends Retained Earnings (To close dividends)