What's today's rate between the U.S. dollar and the RMB Yuan? 今天美元和人民币之间的汇率是多少？

One hundred U.S. dollars is equal to seven hundred and forty-three RMB Yuan by the bank's buying rate today 中国银行今天100美元对人民币的买入价为人民币743元。

I suggest you change your pound into RMB first,then change your RMB into U.S. dollar.It's more beneficial to you. 我建议您先把英镑换成人民币，然后再把人民币换成美元，这样对您更有利。

Thank you for your suggestion,but why? 谢谢你的建议，但为什么呢？