The Answer Is Not 0

Consider air at sea level on the surface of the earth at \(20^o~C\), pressure \(p_0\) (in Pascals) and a mass density \(\rho_0\). Let the pressure 10 m above sea level be \(p_{10}\). Let the pressure 20 m above sea level be \(p_{20}\). What is

\(\frac{p_0-p_{20}}{p_0-p_{10}}-2\)?

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

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