//use the class-selector .fe because fee is the class attribute
var $fees = $('.fee').change(function(){
var total = 0;
//iterate through all the fee elements and find the total
$fees.each(function(){
total += (parseFloat($.trim(this.value)) ||0)
})
$( "p" ).text( total.toFixed(2) );
});
Demo: Fiddle
solved Display sum of inputs on page with jQuery