pay 20 percent down for it. 这里的20 percent down是什么用法?

pay 20 percent down for it. 这里的20 percent down是什么用法? 美国总统大选obama说 taking it down to 25 percent percent的各种用法 问一个英语句子的问题sales were down almot two percent from January,to Are you prepared to make a ten-percent down payment? when the rates are down fifty percent是什么意思 这里的down是什么词性 20 percent 还是20 percents a 20 percent discount 是指打几折 he set off down中的DOWN的用法,这里为什么用down 可不可以用along代替. turn down it和turn it down的区别是什么? Percent和per cent的区别是什么?