The following is a partial year-end adjusted trial balance. Debits Credits $420,000 $ 46,000 4,500 Account Title Sales revenue Loss on sale of investments Interest revenue Cost of goods sold General and administrative expense Restructuring costs Selling expense Income tax expense 220,000 52,000 56,000 31,000 Income tax expense has not yet been recorded. The income tax rate is 25%. a. Determine the operating income (loss). b. Determine the income (loss) before income taxes. c. Determine the net income (loss)