How to display percentage of discount on product list and product view page in magento1.9?

How to display percentage of discount on product list and product view page in magento1.9?

app/design/frontend/yourpackage/yourtheme/template/catalog/product/price.phtml

Find: (line 397)

<?php endif; /* if ($_finalPrice == $_price): */ ?>

Past above it:

<?php // Discount percents output start ?>
    <?php if($_finalPrice < $_price): ?>
    <?php $_savePercent = 100 - round(($_finalPrice / $_price)*100); ?>
        <p class="special-price yousave">
            <span class="label"><?php echo $this->__('You Save:') ?></span>
            <span class="price">
                <?php echo $_savePercent; ?>%
            </span>
        </p>
    <?php endif; ?>
<?php // Discount percent output end ?>