Hi,
if A1 and A2 contain formulas, testing with ISBLANK() will only work if the formula returns a blank or empty string (""). If the formula returns a number, and the number is zero, ISBLANK() will not work, so you need to change the condition in your IF statement. Something like
=IF(A2=0,A1,A2)
should work
cheers
Teylyn
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