Below are the account balances for Cowboy Law Firm at the end of December. Balances $ 3,900 Accounts Cash Salaries expense 1,450 Accounts payable 1,900 Retained earnings 4,550 Utilities expense 1,100 Supplies 12,300 Service revenue 7,800 Common stock 4,500 Required: Use only the appropriate accounts to prepare an income statement. COWBOY LAW FIRM Income Statement For the Period Ended December 31 Expenses: Total expenses