打折

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1. to give a discount; to give a concession

   打八折  ―  dǎ bā zhé  ―  80% of the original price; to give a 20% discount

In Chinese, discounts are given in terms of a percentage of the original price and not the percentage off. Also, the zero in the ones place is usually omitted, so 打三折 would be understood to be 30% of the original price (i.e., a 70% discount) and not 3% of the original price.

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1. discount; concession

   打折票  ―  dǎzhé piào  ―  discount ticket