Below are the account balances for Cowboy Law Firm at the end of December. Accounts Balances Cash $ 3,800 Salaries expense 1,400 Accounts payable 1,800 Retained earnings 4,700 Utilities expense 1,200 Supplies 12,200 Service revenue 7,700 Common stock 4,400 Required: Use only the appropriate accounts to prepare an income statement.