Analyzing and Computing ] Following is the stockholders Computing Issue Price, Treasury Stock Cost, and Shares Outstanding a stockholders' equity section of the 2015 Caterpillar Inc. balance sheet. LO1, 2 CATERPILLAR INC. Stockholders' Equity (S millions) (CAT) 2015 2014 2013 $ 5,238 $ 5,016 $ 4,709 stock of $1.00 par, Authorized shares: 2,000,000,000: egyed shares (2015, 2014, and 2013-814,894,624 shares) at paid-in amount ...... Treasury stock (2015: 232,572,734; 2014; 208,728.065; and 2013: 177,072,282 shares) at cost .. Profit employed in the business...... Accumulated other comprehensive income (loss)... Noncontrolling interests ....... Total stockholders' equity .... (17,640) 34,208 (6,997) (15,726) 33,887 (6,431) 80 $16,826 (11.854) 31,854 (3.898) 67 $20,878 76 $14,885 a. How many shares of Caterpillar common stock are outstanding at year-end 2015? b. What does the phrase "at paid-in amount" in the common stock account mean? C. At what average cost has Caterpillar repurchased its stock as of year-end 2015? Why would a company such as Caterpillar want to repurchase its common stock? e Explain how CAT's issued shares" remains constant over the three-year period while the dollar amount of its common stock account increases