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Level 1

I have 3 radio buttons, who each relate to a seperate entity. I would like to know, if possible, If I click on radio button A can I wirte a code for it to automatically populate numerical field A with the tax associated (12%) with the total of numerical field X? Can the same be done for the two other radio buttons?

I'm a novice live cycler and am at my wits end with this request. Any help is greatly appreciated!