[bullant]

There must be something else going on in your code that you haven't posted.

In this demo, the output in the alert() is 37.5

        
<script type="text/javascript">
            function displaymember(){
                var x = [1,2,3,4,5,6,7,8];
                
                var f=3;

                percent=f/x.length * 100;

                alert(percent);
            }
            displaymember();
</script>