Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| C_{low} | C_{high} | I_{low} | I_{high} | Category |
| --- | --- | --- | --- | --- |
| 0 | 12.0 | 0.0 | 50.0 | Good |
| 12.1 | 35.4 | 51.0 | 100.0 | Moderate |
| 35.5 | 55.4 | 101.0 | 150.0 | Unhealthy for Sensitive Groups |
| 55.5 | 150.4 | 151.0 | 200.0 | Unhealthy |
| 150.5 | 250.4 | 201.0 | 300.0 | Very Unhealthy |
| 250.5 | 350.4 | 301.0 | 400.0 | Hazardous |
Question:
What's the i_{high} value when C_{low} is 250.5?
Answer:
400.0