The Answer Is Not 0

Consider air at sea level on the surface of the earth at 20o C20^o~C, pressure p0p_0 (in Pascals) and a mass density ρ0\rho_0. Let the pressure 10 m above sea level be p10p_{10}. Let the pressure 20 m above sea level be p20p_{20}. What is

p0p20p0p102\frac{p_0-p_{20}}{p_0-p_{10}}-2?

You may consider air to be entirely nitrogen for the purposes of this problem.
The acceleration of gravity is 9.8 m/s2-9.8~m/s^2.

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