What is the exchange rate for American currency today?

今天的美元兑换汇率是多少?

Today's exchange rate is RMB 827 to US $ 100.

今天的兑换汇率为827元人民币兑换100美元。

I right.

好的。

Could you fill out this exchange memo, please?

请填写这张兑换单好吗?

Here you are.

给你。

exchange n.交换;兑换，兑换率 vt.调唤，交换;交流

memo n.备忘录