I AM LEARNING JAVASCRIPT IN YOUR CHANNEL I GOT THIS ERROR AND ANY ONE FIX THIS BUG


B.tech Percentage Calculator

function student(name,marks,sem)
{
var this.name = name;
var this.marks = marks;
var this.sem =sem;
var this.percentage=percalculation;
}
var sai=new student('saigopi',487,'3-1');

function percalculation()
{
var per=this.marks+100;
return per;
}





document.write(sai.percentage());