Hi guys (and girls) !

I'm trying to make a script that adds up the price of selected items and shows the total price.
Something like when configuring a iMac of MacBook at the apple.com store

There is a basic price, lets say $100.
If you click on extra item #1, it gets a class .selected and the value of item #1, lets say $10 sould be added to $100 so the total is $110.

Not very complicated concept, but i'm not very good with JS/jQ. Here's what I've got so far.
Appriciate your help!

1.         <script type="text/javascript" charset="utf-8">
           
               $(document).ready(function () {
           
                   var basicprice = 100;
                   var price = '';        
           
                   $(".product").click(function() {
                   
                       if($(this).hasClass("selected")) {
                           $(this).removeClass("selected");
                       } else {
                           $(this).addClass("selected");
                       }
   
                   });
           
                   // Something missing here...
   
                   var total = basicprice + price;            
                   $('#price').html(total);
                   
   
               })            
           </script>