1. Open Excel and select the cell where you want to display the result.
2. Type the formula: =ABS((A-B)/((A+B)/2))*100, replacing "A" and "B" with the cell references for your data points.
3. Press Enter to calculate the result.

That's it! You now have the relative percent difference between your two data points. Let me know if you have any other questions or if there's anything else I can help you with.