title: Calculate difference between two values in jquery
body: <p>How do I calculate the difference between the top one and the bottom one with jquery?</p>
  
  <pre><code>&lt;span class="field-content"&gt;9.75&lt;/span&gt;
  &lt;span class="field-content"&gt;4.75&lt;/span&gt;
  </code></pre>