Marks Corporation's stockholders' equity at December 31, 2017, is as follows:

Common stock, $10 par (10,000 shares)

$100,000

Paid in Capital in excess of par

3,000

Retained Earnings

197,000

Total Stockholders' Equity

$300,000

The following treasury stock transactions occurred during 2018.

Jan. 2Purchased at $12 per share, 1,000 shares of their own stock.

Feb. 4Sold 500 shares of treasury stock at $13 per share.

May 10 Sold 500 shares of treasury stock at $8 per share.

Prepare journal entries to record treasury stock transactions in 2018 under the cost method.