# 复利与投资

### 复利

```
$1,000 after 3 years at 7% | $1,225.04
```

默认假设的是每年复利周期，但您也可以指定按月或按季复利周期：

```
$1,000 for 3 years at 7% compounding monthly   | $1,232.93
$1,000 for 3 years at 7% compounding quarterly | $1,231.44
```

您还可以获取特定时间段产生的利息：

```
interest on $1,000 after 3 years @ 7%                      | $225.04
interest on $1,000 for 3 years at 7% compounding monthly   | $232.93
interest on $1,000 for 3 years at 7% compounding quarterly | $231.44
```

### 投资回报率 (ROI)

```
$500 invested $1,500 returned                                  | 2x
annual return on $1,000 invested $2,500 returned after 7 years | 13.99%
```

### 未来资金的现值

```
present value of $1,000 after 20 years at 10% | $148.64
```


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