In the two-month period June 1–July 31, 2011, Hess Corp. (HES) stock decreased from $80 to $70 per share, and Exxon Mobil (XOM) stock decreased from $83 to $80 per share.† If you invested a total of $21,490 in these stocks at the beginning of June and sold them for $20,500 at the end of July, how many shares of each stock did you buy? HES shares XOM shares Solution.