Price for members 50%

Hello,
now I post my question in the correct categorie. Before I accidentally put it in the category "Pre-Sales-Questions".

In the custom fields I would like the registrants to choose whether they are a member of the club or not.
Members have only to pay 50% of the price. Because I have now a percentage, I do not know how I should solve it with radio-buttons or checkboxes. There I could only enter values that were added.
Could "Fee formula" be the solution? For example with

[EB_BASE_PRICE] * 2 if not a member

or

[EB_BASE_PRICE] / 2 if a member

Please see my answer for your other post www.joomdonation.com/forum/questions/589...mbers-50.html#102174

Tuan

Please see my answer for your other post www.joomdonation.com/forum/questions/589...mbers-50.html#102174

Tuan