Many people will be very familiar with 成 chéng, mainly from its meaning 'to be become [something]', but did you know that it means 10 percent?
People commonly rate their mobile phones on a scale from 五成 (50 percent) 到十成 (100 percent) based on how old they are. Less than 五成 is 旧 (don't bother measuring it.) My phone is 旧.
So, 成人，Q: 你的手机多久？。。。A: 八成。
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