how to add decimal numbers in js?

Question

JavaScript

There is a basket, and fractional numbers (up to 100) are used there, how to do the addition, even with parseFloat and toFixed (2) I get crap knows what:
Picture of the basket itself:

Image of an error when clicking on increasing the amount in the basket:

Code for clicking on arrow:

$('.g_num__prev').click(function(){
    var arr = $(this),
            id = arr.attr('data-prod-id'),
      input = arr.closest('.g_num').find('input'),
      curr = $('#_cart_price_' + id).html().substr(-1);
            price = $('#cart_price_' + id).html(),
      val = input.val();
    if(val>1){
      var num = Number(input.val()) - 1;
      input.val(num);
            $('#cart_total_' + id).html((Math.round((num * price)*100)/100).toFixed(2));
            $('#_cart_total_' + id).html((Math.round((num * price)*100)/100).toFixed(2)+""+curr);
            var tot = 0;
            $('.total').each(function (t, e) {
            	var str = $(e).html().substring(0, $(e).html().length - 1);
            	console.log(tot);
                tot = tot.toFixed(2) + parseFloat(str).toFixed(2);
                tot = tot.toFixed(2);
            });
            $('#in_total').html(tot);
    }
  });

Website (if needed)

Answer 1

In the 6th line, try replacing with Calculation :

var tot = 0;
$('.total').each(function (t, e) {
  tot += Math.round(parseFloat($(e).text()) * 100);
});
tot /= 100;