How do you quick distinguish and compute "75折“ "7.5折“ and ”75% off" ?

I'm going crazy in this discount... anyone have some good idea?

submitted by /u/Noahlesley
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from r/ChineseLanguage: a community for people who are studying, teaching, or interested in Chinese! https://www.reddit.com/r/ChineseLanguage/comments/9yreyu/how_do_you_quick_distinguish_and_compute_75折_75折/

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