title: Rails: remove decimal from number_to_currency
body: <p>I have a float price:</p>
  
  <pre><code>number_to_currency(m.price, :locale =&gt; 'en_us')
  </code></pre>
  
  <p>I get: <code>$39.00</code></p>
  
  <p>How can I remove <code>.00</code>, I want get:</p>
  
  <pre><code>$39
  </code></pre>