1calc_total();
2
3$(".choose").on('change', function(){
4  var parent = $(this).closest('tr');
5  var price  = parseFloat($('.price',parent).text());
6  var choose = parseFloat($('.choose',parent).val());
7
8  $('.total',parent).text(choose*price);
9
10  calc_total();
11});
12
13function calc_total(){
14  var sum = 0;
15  $(".total").each(function(){
16    sum += parseFloat($(this).text());
17  });
18  $('#sum').text(sum);
19}