The following data (in thousands of dollars) have been taken from the accounting records of Riley Corporation for the most recent year. Administrative expenses $ 600 Finished goods inventory, beginning 480 Finished goods inventory, ending 640 Cost of goods manufactured 2,160 Sales 3,960 Selling expenses 560 Work in process inventory, beginning 280 Work in process inventory, ending 200 The operating income for the year (in thousands of dollars) was: