Cant find my error
<p>I am trying to find my error, but this code does not work:</p>

<pre><code>$marginprice = $retProd['price']['FormattedPrice'];
$marginten = '10';
if ($marginprice &lt; $marginten) {$marginprice + '7';}
else {$marginprice + '12';}                 
update_post_meta($lastId, '_price', $marginprice);
</code></pre>
