Here's the odds with both the Normal and Spider being 100% het Ghost.
12.5%: Normal
12.5%: Het Orange Ghost 100%
12.5%: Het Orange Ghost 50%
12.5%: Orange Ghost
12.5%: Spider
12.5%: Spider, Het Orange Ghost 100%
12.5%: Het Orange Ghost, Spider 50%
12.5%: Orange Ghost, Spider
But seeing as how you will not know which normals or which Spiders are het they will all be considered 66% het Ghost.
Please someone correct me if I'm wrong but I do beleive this to be correct.
Gavin