It would be this as follows:
- Humidity of 90% • Reading with the most water in the air (C)
- Humidity of 10% • Reading with the lowest amount of water in the air (D)
- Humidity of 20% • Reading that shows the air could hold 80% more water (B) | **100 - 80 = 20** **20 + 80 = 100**
- Humidity of 80% • Reading with 80% of water in the air (A)