JSFiddle - React, Tailwind, and code Playground

by Al Kasih

HTML

<select id="jumlahQuan">
    <option>1</option>
    <option>2</option>
    <option>3</option>
    <option>4</option>
    <option>5</option>
</select>
<p id="numeric">200.000</p>
<div id="subTotalContent">Total: 200.000</div>

JavaScript

$(function () {

    var select = $('#jumlahQuan');
    select.change(function () {
        var price = parseInt($('#numeric').text());
        var productQuantity = parseInt(select.val());

        $('#subTotalContent').html(null).append("Total: " + (productQuantity * price).toFixed(3));
    });
});