checkboxes, if checked need to sums its price in divs

I have a page (here you can see it) in which if i click on a checkbox I need to sum its price to actual price.

The checkboxes have a value and a data-prezzo. those two numbers need to sums to two different divs like that:

value + rata-display-1 = total_rata

data-prezzo + prezzo-somma = total_prezzo

I'm new so i don't know why it gave me NaN instead the correct sum.

here's the code:

//sommo rata e prezzo dei plus a quelli del DB
var basicPrice_rata = 1000 ; // This is how we start
var basicPrice_prezzo = 50000 ; // This is how we start
    
$(document).on('change', getCheck);
    function getCheck() {
    var currentPrice_rata = basicPrice_rata; // every time
    CurrentPrice_rata = basicPrice_rata;
    var currentPrice_prezzo = basicPrice_prezzo; // every time
    CurrentPrice_prezzo = basicPrice_prezzo;
        plus = [],
        total_rata = 1000;
        total_prezzo = 50000; 

    $("input[type=checkbox]").each(function(i, el) {

        if ($(el).is(":checked")) {
            total_rata += parseInt($(el).val());
            total_prezzo += parseInt($(el).data('prezzo'));

            console.log(total_rata);
            plus.push($(el).data('name')); // get the label text
            }
    });


//inserisco i nomi dei plus nella riga di testo
 $("#plus-display").text(plus.join(", "));
    
//inserisco le rate sommate  nei div corrispondenti
 $('#rata-display-2').text(total_rata +" €");
    
//inserisco i prezzi sommati  nei div corrispondenti
 $('#prezzo-somma').text(total_prezzo +" €");

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="checkbox" value="134.24" data-prezzo="40000" id="box-auto" name="Box auto" data-name="Box auto" class="check-plus w-checkbox-input">
<input type="checkbox" value="17.78" data-prezzo="5000" id="posto-moto" name="Posto moto" data-name="Posto moto" class="check-plus w-checkbox-input">
<input type="checkbox" value="134.24" data-prezzo="40000" id="box-auto" name="Box auto" data-name="Box auto" class="check-plus w-checkbox-input">

<div id="rata-display-2" class="prezzo-checkout">1000 €</div>

<div id="prezzo-somma" class="text-checkout color bold">500000 €</div>

<div id="plus-display" class="text_piccolo black checkout">Interior Pack Incluso nel prezzo</div>