Please explain especially the common stock being at zero and what dividends in arrears are. Thank you!

A company had stock outstanding as follows during each of its first three years of operations: 2,000 shares of $10, $100 par, cumulative, nonparticipating preferred stock and 50,000 shares of $10 par common stock. The amounts distributed as dividends are presented below. Determine the total and per share dividends for each class of stock for each year by completing the schedule. Preferred Total Per Share Common Total Per Share Year Dividends $10,000 25,000 60,000