In January 2021, Simple Inc. was incorporated and issued 10,000 shares of its $10 par value common stock for $15 per share. In November 2021, the corporation reacquired 1,000 shares of its outstanding stock for $12 per share.

a. The acquisition of these treasury shares in November ________ total stockholders' equity.

Option 1: increased

Option 2: decreased

Option 3: did not change

b. Assuming no other stock related transactions, what was the total common shares outstanding on December 1?