What script/code will make data appear in a cell when a radio button is selected?

https://nccer.box.com/s/ave99z5oq3avkixem9o13tdpjpyds156

When a customer chooses if they want their order expedited (see hyperlink above for document) they will choose an appropriate radio button to designate that choice. In return, I want their choice of radio button to input a value into the cell labeled "Expedite Fee."

What and which script is necessary for this action? I'm very new to javascript and formcalc.

Thanks!