How to show special price percentage||discount percentage in Magento

<?php
$_finalPrice = $this->helper('tax')->getPrice($_product, $_product->getFinalPrice());
$_regularPrice = $this->helper('tax')->getPrice($_product, $_product->getPrice());
if ($_regularPrice != $_finalPrice):
$getpercentage = number_format($_finalPrice / $_regularPrice * 100, 2);
$finalpercentage = 100 - $getpercentage;

echo 'SAVE '.number_format($finalpercentage, 0).'%' ;

endif;
?>