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。
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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｝.
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The correct pronunciation is :
じゅう に てん ご パーセント
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It is not correct. Its pronunciation is Jū ni-ten go pāsento. (じゅう に てん ご ぱーせんと)
