A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data.
The only things I would suggest would be to,
- Make sure that Formulas ► Calculation Options is set to Automatic
- Change the number format to General to see if the result clears up, then back to percent.
I would imagine that B15 holds a formula like =SUM(B3:B14). You can use that in the accumulative percent formula in place of $B$15 like this,
=SUM(B$3:B3)/SUM($B$3:$B$14)