please full calculation and explanation

Western Grass Inc Equity Section of Balance Sheet December 31, 2017 Contributed capital: Preferred shares, $5 cumulative, 10,000 shares authorized, issued, and outstanding.... Common shares, 100,000 shares authorized; 75,000 shares 120,000 issued and outstanding. Total contributed capital 450,000 570,000 534,000 $1,104,000 Retained earnings Total equity pequlred Using the information provided, calculate book value per common share assuming a. There are no dividends in arrears. b. There are three years of dividends in arrears