Riverbed Corporation purchased 2,150 shares of its $10 par value common stock for $81,700 on August 1 . It will hold these in the treasury until resold. Journalize the treasury stock transaction. (Credit occount titles are outomatically indented when the amount is entered. Do not indent manually. List debit entry before credit entry. If no entry Is required, select "No Entry" for the account titles and enter O for the amounts.)