On a certain day, the atmosphere has a temperature TO of 20 degrees Celsius and a pressure p0 of 1000 hPa at the surface (z0 = 0). The lapse rate is ?0 = 6 K/km from the surface to 3 km altitude; ?1 = = 3 K/km from 3 km to 6 km altitude. Find the pressure p at an altitude of 5 km.

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