The temperature of a cup of coffee varies according to Newton's Law of Cooling: SI
- = -k(T- A), where T is the temperature of the coffee, A is the room temperature, and k is a positive
constant. If the coffee cools from 100°C to 90°C in 1 minute at a room temperature of 25°C, find the temperature, to the nearest degree Celsius of the coffee after 4 minutes.