How to Detect 40% in the Middle of a Div Using jQuery

How to Detect 40% in the Middle of a Div Using jQuery

Can you please let me know if it is possible to detect the 40% in the Middle of a Div Using jQuery for example in following example I need to enable the mousemove() only on 30% left side or 30% of the right side of the center.

$('#box-wrap').mousemove(function(e){ var x = e.pageX - this.offsetLeft; var y = e.pageY - this.offsetTop; console.log("X: " + x + " Y: " + y); });
html, body{ width:100%; height:100; } #box-wrap{ height:400px; width:100%; background:yellow; }
<div id="box-wrap"></div>