In Pokémon 7th gen, the chance of Effect Spore activating is 30%. However, some types like Steel or Electric are immune to some conditions such as Poison or Paralysis.
In this case, if say, Kartana attacks Shiinotic, is the chance of Effect Spore activating 20% (only Paralysis or Sleep), or 30% (Paralysis and Sleep each has a 15% of activating)? How is it calculated?