In testing a type of insulation, the temperature in a room was made to fall to 2 3 of the initial temperature after 1.0 h, to 2 5 of the initial temperature after 2.0 h, to 2 7 of the initial temperature after 3.0 h, and so on. If the initial temperature was 50.0°C, what was the temperature after 12.0 h?