Exactly what I was looking for!
Thanks a lot!
FYI: Actually I tried this myself too based on some other topic going arround on this fantastic forum.
But all results were equal to 1 or 0 because I did not put the number in '%' and the rounding without decimals (integer) made those numbers like 0.9 or 0.8 turn up as 1 or 0 (integer). Luckily you were there to push me again in that direction :-)