Discounts in Chinese are stated as a percentage of the original price after discount in multiples of 10, so for example a 25% discount is written as 7.5 折 zhé (zhé), that is, 75% of the original price.
Chinese Audio Lesson: How to Understand Discounts in Chinese
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折扣 (zit3 kau3 | zhe2 kou4) : discount; rebate - CantoDict.
折扣 (zit3 kau3 | zhe2 kou4) : discount ... - cantonese.sheik.co.uk
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