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?
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vugusurk Oct 30, 2016
delta/(1+delta) = 1.9996000799840031993601279744051e-4
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iEverX Oct 30, 2016
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% |
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3
forestyuan Oct 30, 2016
两种表达是同一个意思，所以不用计算，直接选 A
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