A Checkbox Question

[Rick K]

Hi,
The attached spreadsheet is a product return form that I am creating. The 4 checkboxes (highlighted in yellow) are to be used if we are to add a restocking fee. Only one checkbox is supposed to be selected at any given time. The checkboxes on the left are irrelevant in this case.

I pointed the first checkbox to cell O25, which when TRUE, activates the formula in cell K48 (calculates a 15% restocking fee and then deducts it from the return amount).

My Dilema: If I point the 3 subsequent checkboxes to cell O25, then ALL the checkboxes show a checkmark, even if only one is clicked.

Can someone one point me in the right direction is to how to make the checkboxes work correclty? I left all the checkboxes pointed to O25; wasn't sure how I should've posted that.

Thanks
Rick