title: Calculate percentage saved between two numbers?
body: <p>I have two numbers, the <em>first</em>, is the original price, the <em>second</em>, is the discounted price.</p>
  
  <p>I need to work out what percentage a user saves if they purchase at the second price. </p>
  
  <pre><code>example
  25, 10 = 60%  
  365, 165 = 55%
  </code></pre>
  
  <p>What I dont know is the formula to calculate this.</p>