title: Plot percentages on y-axis
body: <p>I'm plotting a graph using this</p>
  
  <pre><code>plot(dates,returns)
  </code></pre>
  
  <p>I would like to have the <code>returns</code> expressed as percentages instead of numbers. <code>0.1</code> would become <code>10%</code>. Also, the numbers on the y-axis appear tilted 90 degrees on the left. Is it possible to make them appear horizontally?</p>