Below are the account balances for Cowboy Law Firm at the end of December. Cash Accounts Balances $ 5,400 Salaries expense 2,200 Accounts payable 3,400 Retained earnings 3,900 Utilities expense 1,200 Supplies 13,800 Service revenue 9,300 Common stock 6,000 Required: Use only the appropriate accounts to prepare an income statement. COWBOY LAW FIRM Income Statement For the Period Ended December 31 Service revenue Expenses: $ 9,300 Salaries expense 2,200 Utilities expense 1,200 Total expenses 3,400 Net income