Так?
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="elevator">
<input type="radio" id="lift" class="a1" value="200" name="itemtype1" checked />
<span id="lift2">200</span>
<input type="radio" id="net_lift" class="a1" value="150" name="itemtype1" /> 150
<input type="radio" id="net_lift" class="a1" value="10" name="itemtype1" /> 150
<input type="radio" id="net_lift" class="a1" value="1500" name="itemtype1" /> 150
<br/>
<input type="number" id="count2" name="Количество2" value="0" min="0" />
<input type="number" id="count3" name="Количество3" value="0" min="0" />
</div>
<br> Итого:
<span id="final_price_yslug">0</span> руб
<script>
jQuery(function($) {
var calc = function() {
var price = 0;
$('#elevator .a1:checked').each(function() {
price += parseInt($(this).val());
});
price *= Math.max(1, parseInt($('#count2').val()));
price *= Math.max(1, parseInt($('#count3').val()));
$('#final_price_yslug').text(price);
};
$('#elevator .a1').on('change', calc);
$('#elevator #count2, #elevator #count3').on('input', calc);
});
</script>
</body>
</html>