You can translate that as: **今日汇率:8000人民币兑换美元**
If you want to be slightly more formal or precise, you could also say:
**当前汇率:8000人民币兑美元**
Both are commonly understood in
> search(help me translate Convert 8000 RMB to USD: Current Exchange Rate and Step-by-Step Calculation to Chinese)将 8000 人民币兑换成美元:当前汇率与逐步计算【8000 rmb usd】