Regarding % Completion Formula
I am having a rather confusing issue. For my sheet referenced below  I am attempting to calculate the percent completion using this formula: =MIN((TODAY()  Start@row) / ([Actual Finish]@row  [Actual Start]@row), 1)
When i insert it in Column 36 below it works.. but when place the same formula in the 5 Complete column the formula doesn't pick up?! what am i doing wrong?
2 part:
I also need help with wrapping the formula in an IF statement: for example, the dates Actual Start Date and Actual Finish Dates are blank  i need it to return 0%. right now I'm getting an error message that says # Divide by zero . not sure how i can work around this. example below
I would be grateful if someone that's more formula savvy can guide me.
Answers

You cannot use formulas in a column being used by the Dependency settings. That is why it works in Column36 but not in the % Complete column. The % Complete column is most likely being used in the dependencies.
To get rid of the error, you would just wrap the whole thing an an IFERROR.
=IFERROR(MIN(....................), "")
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