请问英语：85折怎麼讲？你付现金还是刷卡？

85 折 15 percent off （更常用）
15 percent discount

你付现金还是刷卡？

You want to pay in cash or card?

更简单的：cash or card?

85折 15 percent(discount) off discount可以省略.
你付现金还是刷卡 You pay in cash or by card?

fifteen percent off, cash or credit card?

15% discount off do U pay in cash or by credit card？

85折扣 15% discount

付现金还是刷卡 Do you want to pay by cash or by card?

15 percent off.
cash or card?