The following is a partial year-end adjusted trial balance. Account Title Debits Credits Sales revenue 300,000 Loss on sale of investments 22,000 Interest revenue 4,000 Cost of goods sold 160,000 General and administrative expenses 40,000 Restructuring costs 50,000 Selling expenses 25,000 Income tax expense 0 Income tax expense has not yet been recorded. The income tax rate is 40%. a. Determine the operating income (loss). b. Determine the income (loss) before income taxes. c. Determine the net income (loss).