NASA is planing a mission to Mars that will monitor the Martian surface from an altitude of 20km. The Martian atmosphere behaves as an ideal gas, and its temperature (200K) is independent of altitude. Given that the ideal gas constant for Mars atmosphere is R=260Nm/kgK,g= 3.92m/s2, and 0=0.015kg/m3 at Mars surface, compute the density at that altitude