Find this code in your skin1/customer/main/product.tpl file
Code:
{if $product.list_price gt 0 and $product.taxed_price lt $product.list_price}
<TABLE border="0" width="45">
<TR>
<TD width="45" height="45" class="SaveMoneyLabel" background="{$ImagesDir}/save_money.gif" align="center" valign="middle">
{math equation="100-(price/lprice)*100" price=$product.taxed_price lprice=$product.list_price format="%d" assign=discount}
<SPAN id="save_percent">{ $discount }</SPAN>%
</TD></TR></TABLE>{/if}
And replace it with this:
Code:
{if $product.list_price gt 0 and $product.taxed_price lt $product.list_price}
{math equation="100-(price/lprice)*100" price=$product.taxed_price lprice=$product.list_price format="%d" assign=discount}
{if $discount >= 10}
<TABLE border="0" width="45">
<TR>
<TD width="45" height="45" class="SaveMoneyLabel" background="{$ImagesDir}/save_money.gif" align="center" valign="middle">
<SPAN id="save_percent">{ $discount }</SPAN>%</TD>
</TR>
</TABLE>
{/if}
{/if}
This works for Version 4.0.12