$(document).ready(function(){


    $("#extrapage").keyup(function(){
        pages = $("#extrapage").val();
        get_price(pages);
    });
    
    $("input[type=radio]").click(function(){
        pages = $("#extrapage").val();
        get_price(pages);
    });
    
    function get_price(pages){
        var total = 40000;
        $("input[type=radio]:checked").each(function(){
            if (isNaN($(this).val())) {
                total = total;
            }
            else 
                total += parseFloat($(this).val());
        });
        final_price = $(".price_amount").text(total + ((total / 100) * 10) * (pages - 1));
        if (isNaN($(".price_amount").text())) {
            $("#extrapage").val(1);
            $(".price_amount").text(total);
        }
        else 
            if (pages > 1) {
                $(".price_amount").text(total + ((total / 100) * 10) * (pages - 1));
            }
            else {
                $(".price_amount").text(total);
            }
    };
    
    });