$("input[name='harga_tarif']").keyup(function(e){
            // alert('dsf');
            var nilais = $(this).val();

            nilai = nilais.replace(/,/g,"");

            var margin = parseInt(nilai);
            margin = (55/100)*margin;
            margin = margin.toFixed(2);
            margin = numberWithCommas(margin);
            $("input[name='margin']").val(margin);

            nilai = numberWithCommas(nilai);

            $(this).val(nilai);
        })

        function numberWithCommas(x) {
            return x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ",");
        }