Magento 1: Add the saving amount and the discounted percentage

add-saving-amount-percentage.php

<?php if($_finalPrice < $_price): ?>

<?php 
    $_discounted_percentage = 100 - round(($_finalPrice / $_price) * 100); 
    $_saving_amount = number_format(($_price - $_finalPrice), 2);  
?>
    <p class="saving-price">
        <span class="price-label"><?php echo $this->__('Your Save: '); ?></span>
        <span class="price">
            <span class="saving-amount">
               <?php echo $_coreHelper->formatPrice($_saving_amount, false) ?>                        
            </span>
            <span class="discounted-percentage">
                <?php echo $_discounted_percentage; ?>%
            </span>
        </span>
    </p>
<?php endif; ?>