One year ago, LaDonna purchased 140 shares of General Motors' common stock for $30 per share. Every three months during the time that she held the stock, LaDonna received a quarterly dividend equal to $0.20 per share. A total of four dividends were received. LaDonna sold her shares last week for $37 per share. What yield did she earn on her investment? (Provide your answer in percentage with two decimal places.)