Out of the signed contracts, what percentage of them have the 20% discount?
What percentage of the signed contracts are discounted at 20% off?
締結済みの契約のうち2割引きで契約されたものは何%ですか と言いたい場合は
「Out of the signed contracts, what percentage of them have the 20% discount?」と言います
もしくは
「What percentage of the signed contracts are discounted at 20% off?」
What percentage=そのうちの何%
Signed contracts=締結済みの契約
Off, discount=割引
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What percentage of the signed contracts were negotiated at a 20% discount?
What percentage of the signed contracts were negotiated at a 20% discount?
signed contracts(締結済みの契約)と at a 20% discount(20%引き・2割引きで)を使うことで伝わります。
また、よりフォーマルな法務・事業分析の文脈で尋ねたい場合は
What percentage of the executed contracts were signed with a 20% discount?
executed contracts(締結・発効された契約)は、ビジネス契約において非常に厳密で使い勝手の良い用語です。