I have the formula
=SUMPRODUCT((A2:A1000="2008")*(B2:B10000.01)*(C2: C10000.01)*(B2:B1000))/SUMPRODUCT((A2:A1000="2008")*(B2:B10000.01)*(C2:C 10000.01)*(C2:C1000))
It verifies the year and that both column B & C have a value entered and
then it divides B/C to give me a percentage. It seems to work fine but it
will only calculate if i click in the formula and hit enter. Ive tried
changing it to automatic but that returns a 0 for some reason. In manual it
won't recalc when I hit f9 either.