JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <thead>
        <tr>
            <th>Quantity</th>
            <th>&nbsp;</th>
            <th>Price</th>
            <th>Sum</th>
        </tr></thead>
    <tbody>
        <tr class="sum">
            <td><input class="qty" type="text" value="1" /></td>
            <td>German format: </td>
            <td data_price="1375.5">1.375,50 &euro;</td>
            <td></td>
        </tr>
        <tr class="sum">
            <td><input class="qty" type="text" value="1" /></td>
            <td>English format:</td>
            <td data_price="1375.5">&euro;1,375.50</td>
            <td></td>
        </tr>
        <tr class="sum">
          <td><input name="text" type="text" class="qty" value="1" /></td>
          <td>French format:</td>
          <td data_price="1375.5">1 375,50 &euro;</td>
          <td></td>
        </tr>
        <tr class="sum">
          <td><input name="text2" type="text" class="qty" value="1" /></td>
          <td>Italian format:</td>
          <td data_price="1375.5">&euro;1,375.50</td>
          <td></td>
        </tr>
        <tr class="sum">
             <td><input class="qty" type="text" value="1" /></td>
             <td>Spanish format:</td>
            <td data_price="1375.5">&euro; 1.375,50</td>
            <td></td>
        </tr>
        <tr>
            <td colspan="3">Total</td>
            <td id="total"></td>
        </tr>
    </tbody>
</table>

JavaScript

var total = 0;

$(".sum").each(function(){
    var qty = parseInt($(this).find(".qty").attr("value"));
    var price = parseFloat($(this).find("td[data_price]").attr("data_price"));
    
    total += qty * price;
});

$("#total").text(total.toFixed(2));