How do I find average total equity

The 2016 income statement for Anderson TV and Appliance reported sales revenue of dollar 420, 000 and net income of dollar 65,000. Average total assets for 2016 was dollar 800, 000. Shareholders' equity at the beginning of the year was dollar 500, 000 and dollar 20, 000 was paid to shareholders as dividends. There were no other shareholders' equity transactions that occurred during the year. Calculate the profit margin on sales, return on assets, and return on shareholders' equity for 2016