Fee Formula

Hi,
I want to be able to divide by 2 the current amount depending on a user's boolean choice.
I created a radio field, with No/Yes values, No as default value, and 1 and 2 as fee values. My formula is "/[FIELD_VALUE]" and it creates an error.
What should be the setup of the field ?
A checkbox could also work UI-wise, but I don't know how to set it up.
And I will need 2 of these fields, each dividing the preceding amount by 2.... I wonder if this even possible !
Could someone point me in the right direction, please?
-Mathieu

What's preceding amount here? Could you please give me more information?

Tuan

The previous amount come from a custom list field, which attributes a fee value to a list of countries (the name is country_name).
This works OK.
I then want this value halfed if a user is under 35.
So I created a radio field "Yes / No" with the question "Are you under 35?" and 1 and 2 as Fee values.
I used [COUNTRY_NAME]/[FIELD_VALUE], but that did not work.
I then used /FIELD_VALUE], which did not work either.
I then used 1 and 2 as values, but to no avail.

Hard to explain. So better submit a support ticket sending me:

1. Link to registration form

2. Super user account

3. Tell me ID of the two custom fields

I will try to setup the right formula for you and you can check the result

Tuan