A refrigerator is operating between two temperatures, the sink is at 4°C, and the source is at 30°C. If the heat from the source is 300 kJ, the heat of the sink is 200 kJ, and the work is 100 kJ, what is the ideal (reverse Carnot) efficiency?
A) 66.67%
B) 75%
C) 80%
D) 85.71%
