Exercise 15-10 For a recent 2-year period, the balance sheet of Martinez Company showed the following stockholders' equity data at December 31 (in millions) 2017 2016 Additional paid-in capital Common stock Retained earnings Treasury stock $910 675 7,210 1,833 $6,962 $846 663 5,300 Total stockholders' equity $5,810 Common stock shares issued Common stock shares authorized Treasury stock shares 225 500 39 221 500 27 (a) Answer the following questions. (1) What is the par value of the common stock? (Round par value to 2 decimal places, e.g. $3.15.) Par value of common stock (2) What is the cost per share of treasury stock at December 31, 2017, and at December 31, 2016? December 31, 2017 December 31, 2016 Cost per share of Treasury stock