Discussion on the accuracy of parseFloat method in javascript

<script language="javascript">
var a = "0.11";
var b = "0.2801";
var c = "1.002";
var sum1 = parseFloat(a) + parseFloat(b) + parseFloat(c);
var sum2 = (parseFloat(a) + parseFloat(b) + parseFloat(c)).toFixed(4)
("a+b+c=" + sum1);
("<br/>")
("a+b+c=" + sum2)
</script>