A thermometer reading 8°C is brought into a room with a constant temperature of 20°C. If the thermometer reads 18°C after 5 minutes, what will it read after being in the room for 7 minutes? Assume the cooling follows Newton's Law of Cooling: U = T + (Uo - T)ekt. (Round your answer to two decimal places.)
a. 1.6°C
b. 20.98°C
c. 19.02°C
d. 20°C