Online booking form

I need a registration form with a few fields that add up totals of some options, the form is already designed, I just need the fields with choice of hotel room, how many nights and how many people, the dollar amount must then sum together. The next field required is the amount of people attending and then add this total together. At the end fo the form a total amount, hotel + attendance fee is summed together, easy job but need it today or tomorrow morning at the latest.