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Hm... I don't know... But I am totally sure that the last phrase is incorrect. It must be "два с половиной процента", believe me :)

As for целый/целая, I have never heard or read "один целый", but...

I'm not sure it is correct. I'd say "одна целая, восемь десятых миллиона"


It will be correct if you change "миллионов" to "миллиона" (and, of course, живут => живет). But it is better to say...