Simplify `subscribe_task_stats!`
Simplify `subscribe_task_stats!`

Use the power of `Fload#round`:

```
 pi = 3.141592653589793
 => 3.141592653589793
1.9.3-p551 :014 > (pi * 100).round / 100.0
 => 3.14
1.9.3-p551 :015 > pi.round(2)
 => 3.14
```
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