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:
| Engine | Power, continuous | Critical altitude This is the highest altitude at which the engine can achieve its full continuous power rating. Above this altitude, power falls off with height as with a naturally aspirated engine . See Supercharger#Altitude effects for details. | Power, takeoff | Compression ratio | Supercharger gear ratio | Octane rating | Dry weight |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Wasp Jr. A | hp (kW) at 2,000 RPM | sea level | same | 5.0:1 | 7:1 | 68 | lb (kg) |
| Wasp Jr. TB | hp (kW) at 2,200 RPM | sea level | hp (kW) at 2,300 RPM | 6.0:1 | 8:1 | 80 | lb (kg) |
| Wasp Jr. SB | hp (kW) at 2,200 RPM | ft (m) | hp (kW) at 2,300 RPM | 6.0:1 | 10:1 | 80/87 | lb (kg) |
| Wasp Jr. T1B2 | hp (kW) at 2,300 RPM | ft (m) | same | 6.0:1 | 10:1 | 80/87 | lb (kg) |
| Wasp Jr. B4 | hp (kW) at 2,300 RPM | ft (m) | same | 6.0:1 | 10:1 | 80/87 | lb (kg) |
Question:
When critical altitude is sea level, what is the compression ration for a supercharger gear ratio of 7:1?
Answer:
5.0:1