During the year, the following selected transactions affecting stockholders' equity occurred for Navajo Corporation: a. Feb. 1 Repurchased 310 shares of the company's own common stock at $20 cash per share. b. Jul. 15 Sold 90 of the shares purchased on February 1 for $21 cash per share. c. Sept. 1 Sold 60 of the shares purchased on February 1 for $19 cash per share. Required: 1. Prepare the journal entry required for each of the above transactions. (If no entry is required for a transaction/event, select "No journal entry required" in the first account field.)