text: MathJax.Hub.Config({    
      extensions: ["tex2jax.js"],    
      "HTML-CSS": { scale: 100}    
    });   
  
  function op(){
  var coll = document.getElementById("collapsible");
  var i;
  console.log("hi");
  for (i = 0; i < coll.length; i++) {
    coll[i].addEventListener("click", function() {
      this.classList.toggle("active");
      console.log("hi");
      var content = this.nextElementSibling;
      if (content.style.maxHeight){
        content.style.maxHeight = null;
      } else {
        content.style.maxHeight = content.scrollHeight + "px";
      } 
    });
  }}
  
  function findPart(){
  	var tot = document.getElementById("tot1").value;
  	var perc = document.getElementById("perc1").value;
  	var ans = (tot * perc) / 100;
  	document.getElementById("ans1").innerHTML = ans;
  }
  
  function findPerc(){
  	var tot = document.getElementById("tot2").value;
  	var part = document.getElementById("part2").value;
  	var ans = (part / tot) * 100;
  	document.getElementById("error2").innerHTML = "";
  	document.getElementById("ans2").innerHTML = ans+'%';
  	if(tot==0){
  		document.getElementById("error2").innerHTML = "You tried to divide by 0. Check out the formula!";
  	}
  }
  
  function findTot(){
  	var perc = document.getElementById("perc3").value;
  	var part = document.getElementById("part3").value;
  	var ans;
  	if(perc==0 && part==0)
  		ans=0;
  	else 
  		ans = (part * 100) / perc;
  	document.getElementById("error3").innerHTML = "";
  	document.getElementById("ans3").innerHTML = ans;
  	if(perc == 0 && part!=0)
  		document.getElementById("error3").innerHTML = "You tried to divide by 0. Check out the formula!";
  }
  
  function findPercChange(){
  	var ini = document.getElementById("ini").value;
  	var fin = document.getElementById("fin").value;
  	var diff = fin-ini;
  	var ans;
  	if(ini==0 && diff==0){
  		ans=0
  	}
  	else
  		ans = (100 * diff) / ini;
  	document.getElementById("error4").innerHTML = "";
  	if(diff<0){
  		ans = 0-ans;
  		document.getElementById("ans4").innerHTML = ans +'% decrease';
  	}
  	else if(diff==0){
  
  		document.getElementById("ans4").innerHTML = ans +'% increase/decrease';
  	}
  	else{
  		document.getElementById("ans4").innerHTML = ans +'% increase';
  	}
  	if(ini==0 && fin!=0){
  		document.getElementById("error4").innerHTML = "You tried to divide by 0. Check out the formula!";
  	}
  }