How to read １２．５％? I've place it on Google Translate and heard じゅうにてんパーセント, is it correct?
６５歳を超えるアメリカ人は全人口の１２．５％を構成している。
The ・ here is used as the "." would be used in English: to distinguish the round and the decimal part. So it is indeed read as 点{てん}.
So you would read the whole thing as [１２]{じゅうに}[・]｛てん｝[５]｛ご｝[％]｛パーセント｝.
The correct pronunciation is :
じゅう に てん ご パーセント
It is not correct. Its pronunciation is Jū ni-ten go pāsento. (じゅう に てん ご ぱーせんと)
