Magento: Product Discount percent you save

Open

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

if the file is not available in your theme folder copy it from base

Find: // near line no : 397 according to magento 1.9

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

Add above it: add  this custom code:

<?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 ?>