function calculatePrice(){
var price = new Number($('#price').val());
var petroDiscount = new Number($('#petroDiscount').val());
var merchantDiscount=new Number( $('#merchantDiscount').val());
var hsDiscount = new Number($('#hsDiscount').val());
var pp ;
pp = new Number(price - petroDiscount - merchantDiscount - hsDiscount).toFixed(2);
console.log(price +"-" +petroDiscount +"-" + merchantDiscount +"-" +hsDiscount + "="+pp);
}