percent和percentage都是百分比的意思,两者有什么区别?具体该怎么用?麻烦说详细点,最好是附上例句...

percentage：What ercentage of the earth is covered by oceans?地球上百分之多少被海水覆盖着?percent：n.百分之 adj.百分之一,(与基数词连用)百分之...的:We give 10 percent discount for cash.森林覆盖率是60%