# 比率计算

费率是指一个单位数量相对于另一个单位的数量

```
3 hours / day | 3 hours/day
$99 per week  | $99.00/week
```

Soulver 也支持没有单位的费率

```
30 bottles / week  | 30/week
30/week as / month | 130/month
```

您可以添加/减去费率

```
$20/day + $300/week | $440.00/week
```

以及将其转换为其他兼容形式

```
€30/day in €/month | €913.11/month
```

从不同种类单位的除法中也可以生成简化的费率：

```
90 km / 3 day | 30 km/day
```

{% hint style="info" %}
数学要求在除法中，同一单位类别的费率单位必须相互抵消：

3 hours / 3 days = 0.0416667

这本质上是将第一个数字作为第二个数字的比例（10,800 s / 259,200 s），表示为小数。

更方便的做法是在不抵消单位的情况下简化费率。如果您更希望将比例表示为简化费率，可以明确指定格式：

3 hours / 3 days as hour/day = 1 hour/day
{% endhint %}

### 费率乘法

```
$50/week × 12 weeks  | $600.00
$24 a day for a year | $8,765.82
500/day to / year    | 182,621.25/year
```

### 常用费率短语

这里有一些用于进行费率计算的便捷内置短语

```
30 hours at $30/hour | $900.00
$500 at $20/hour     | 25 hours
```


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