Sav2907,
а может, лишнее убрать?
<label><input type="checkbox" name="n1" value="1" id="n1" />100</label><br />
<label><input type="checkbox" name="n2" value="2" id="n2" />30</label><br />
<label><input type="checkbox" name="n3" value="3" id="n3" />60</label><br />
<label><input type="checkbox" name="n4" value="4" id="n4" />50</label><br />
<input id="result"><input id="result2">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
<script>
$("input").click(function() {
var sum = 0, sum2 = 0;
$("input:checked").each(function(){
sum+= +$(this).val();
sum2 += +$(this).parent().text();
});
$('#result').val(sum);
$('#result2').val(sum2);
});
</script>