Math Round Function

Question

I'm using a form that use the following script to calculate the item price including VAT:

function calculateTotaleIVA() {
          var tot = document.getElementById('totale').value;
          document.getElementById('totale_prodotto').value = Math.round(tot*121)/100;
          totale_prodotto.value = document.getElementById('totale_prodotto').value.replace(".", ",");
          totale.value = document.getElementById('totale').value.replace(".", ",");
          }

This function works fine but I have a questions. Some times the result is like this:

46,4

I want to see at screen two digits after point decimal like this:

46,40

How can I fix the above function to solve it?

Thanks in advance.

Answer 1

Use toFixed

(Math.round(tot*121)/100).toFixed(2)