JSFiddle - React, Tailwind, and code Playground

HTML

<select id="aantal_tickets" name="aantal_tickets">
    <option value="1" selected="selected">0 - 100</option>
    <option value="2">101 - 500</option>
    <option value="3">501 - 1000</option>
    <option value="4">1001 - 10000</option>
    <option value="5">> 10000</option>
</select>

<div id="prijs">

</div>

JavaScript

var prijzen = [5,4,3,2,1];

$('select').on('change', function() {
  $('#prijs').html( prijzen[this.value - 1] );
})