What percentage, could you say, would customer satisfaction have to be for our actions to be deemed a success?
ご質問ありがとうございます。
英文は少し長くなりますが、「何%以上の顧客が満足せれば我々の活動は成功と言えますか?」を英訳すると「What percentage, could you say, would customer satisfaction have to be for our actions to be deemed a success?」になります。
ご参考になれば幸いです。