I just wouldn't do it this way. Sorry.
HTML
<div class="packageqty">
<a target="_blank" href="dozentraditionalcookies.html">12 cookies $10</a>
</div>
CSS
.packageqty a {
display:block;
height:50px;
}
It's much cleaner than wrapping a div with an anchor which is just weird even if it validates in HTML5.