<script>
$(document).ready(function() {
   // fix dropdown width
   $('select[name="Mindestlaufzeit"]').parents('div.dropdown-list').css('width','auto');
   // get purchase pricing
   var priceArr = $('select[name="Mindestlaufzeit"]').parents('table').find('tbody tr td:nth-child(2)').map(function(){return parseFloat($(this).text().replace('€','').trim());}).get();
   $('select[name="Mindestlaufzeit"]').change(
		function() {
			let min_duration = $(this).val();
			let index = $('select[name="Mindestlaufzeit"]').prop('selectedIndex');
			
			let tds = $(this).parents('table').find('tbody tr td:nth-child(3)');
			tds.each(
				function(tdIndex) {
					let price = priceArr[tdIndex] / (parseInt(min_duration, 10) + (12 + index));
					if (price <= 7) { price = 7; };
					let priceTag = Number(price)
					$(this).text(priceTag.toFixed(2).replace('.',',') + " €");
				}
			);
		}
   );
});
</script>