百分比
百分比（英语：Percentage），又称“百分率”，“百分数”（符号为“%”）是一种表达比例，比率或分数数值个方法（以百为分母个分数计算），也是无因次量个数字（纯数）。
英文中个Percent一词源自拉丁文per centum，per是“每”、centum则是“百”个意思。
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