I have a text field on my livecycle form where the user enters a postal code.
Essentially I have TOTAL (number field) that is determined from a variety of standard number calculations, but the last step is to increase the TOTAL by either 10%, 15% or 25% depending on the postal code entered in the text field (the location of the user).
In some cases the first 3 digits of the postal code are sufficient to determine which rate increase applies. In other cases the entire 6 digits of the postal code will determine the increase.
Since I am essentially separating postal codes into 3 groups, what's the simplest approach to doing this? The PDF form must remain self contained (no outside links). Thus far I have used hidden number fields for all rating.