Percentages don't work that way with genetics. They're either 100% het or not. The percentages come into play when you produce a clutch that may or may not be het.
For example... if you mate a Het Ghost with a normal, you will have a 50% chance of producing hets so the offspring are considered 50% het. Being that they all look normal, the odds are that half are normal and half are hets.
If you bred a 100% het male with a 50% het female and didn't get any ghosts, you can consider the offspring as 50% possible het because it is unlikely that the female is a het.
If your female proved to be a Het, you would get orange ghosts and 66% poss. Hets. If your female proved to be a normal, you would get all 50% Hets. In case you don't have a full understanding of Possible Hets, here is a good explaination. Your female is either one of two things; 1)Het for orange ghost, or 2) Normal. The 50% part comes in because one of her parents was a Het and the other was normal. By the laws of Mendelian Genetics, half of the offspring are Hets and half of the offspring are normals. The problem with that is in recessive genes, all of those offspring look normal so you can't tell which are Hets and which are not. So, the breeder will call all of the babies 50% Possible Heterozygous for Orange Ghost because each offspring has a 50% chance of being Het. Hope that helps.