I am trying to create a registration form for a conference. In this form, I want to offer multiple discounts based on date of registration (basically an "early bird" program). I am not sure of the best way to do this. I have a form total which basically sums all areas of registration options. Once this total is established, the total should have a discount applied based on the date of submission; prior to May 31 = 15%; June 1 - June 30 = 10%, July 1 - July 31 = 5%; after July 31, no discount is applied. What is the best way to write this into the form? I want to make this as simple to understand as possible for the end-user. Thoughts? Thanks -