问一个超级简单的汇率问题 - V2EX

问一个超级简单的汇率问题 - V2EX

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这是一个创建于 3348 天前的主题，其中的信息可能已经有所发展或是发生改变。

问一个超级简单的汇率问题

美元比人民币今天上涨 0.02%，人民币比美元今天下跌多少？

A:0.020%; B:0.019%.

A OR B?

4 条回复

1

vugusurk

2016-10-30 15:41:35 +08:00

delta/(1+delta) = 1.9996000799840031993601279744051e-4

2

iEverX

2016-10-30 15:45:06 +08:00

昨天 usd/rmb = x
今天 usd/rmb = (1 + p)x
所以 rmb/usd = 1/(1 + p)x = 1/(1+p) * 1/x
下跌 1 - 1/(1+p) = p/(1+p)， p=0.02%

3

forestyuan

2016-10-30 18:35:52 +08:00

两种表达是同一个意思，所以不用计算，直接选 A

4

dikcen

2016-10-30 21:34:58 +08:00

涨跌幅度远小于 1 时可以认为一致，如 @iEverX 说的 p/(1+p)， p 远小于 1 时， 1+p ~ 1 。

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