Rounding formula - I do not know if this is possible

Hello everyone,

This may be a no brainer if it is possible but for me it's brain surgery.

I am calculating fees based on last years invoice + a percentage. The partner wants me to round the new amount to the nearest $5. I know how to round numbers but I don't know if there is a way to write a formula to do this for me.

I cannot seem to figure out how to attach the sample. When I scroll down, there is no GO ADVANCED that I can see and I cannot figure out how to insert a picture

Sample workbook.PNG

I hope someone who knows way more about formulas than I can come up with something. I greatly appreciate any assistance that can be provided.

Best Regards,
Leah