title: Compute percentage for bigdecimals
body: <p>I haven't found any native method to do this, so I created my own in a helper class:</p>
  
  <pre><code>public static BigDecimal percentage(BigDecimal base, BigDecimal pct){
      return base.multiply(pct).divide(new BigDecimal(100));
  }
  </code></pre>
  
  <p>But I don't quite like it, I wonder if the API has something similar. The Number class (ancestor of BigDecimal) would be a nice place.</p>