On a spring day in the midwestern United States, the air temperature at the surface is 28.0 degrees celsius. Puffy cumulus clouds form at an altitude where the air temperature equals the dew point.

Part A

If the air temperature decreases with altitude at a rate of 0.6 degrees celsius/100 m, at approximately what height above the ground will clouds form if the relative humidity at the surface is 35%? (Hint: Use the table following table.)

Temperature degrees Celsius Pressure Pa
10.0 1.23*10^3
12.0 1.40*10^3
14.0 1.60*10^3
16.0 1.81*10^3
18.0 2.06*10^3
20.0 2.34*10^3
22.0 2.65*10^3
24.0 2.99*10^3
26.0 3.36*10^3
28.0 3.78*10^3
30.0 4.25*10^3

Express your answer using one significant figure.

Part B

If the air temperature decreases with altitude at a rate of 0.6 degrees celsius/100 m, at approximately what height above the ground will clouds form if the relative humidity at the surface is 80?%

Express your answer using one significant figure.