Currency conversion

Hi guys,
I’m working on a form that is calculating the total price for selected services and it is in Libyan Dinars. I need to convert it to USD. So I’m using open exchange rate api(https://openexchangerates.org/). There is the jquery function that fetches the rate and converts into usd:

$(document).ready(function(){
$.ajax({
url: ‘https://openexchangerates.org/latest.json? app_id=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx’,
dataType: ‘jsonp’,
success: function(json) {
lyd = json.rates.LYD;
return fieldname37 / lyd;
}
});
});

It is working properly in a stand alone page but I can’t make it work with the plugin. I’ve included the jquery library in the header.php file. (<?php wp_enqueue_script(“jquery”); ?>)
I’ll appreciate any help.