Question 7
At an international conference, 120 headsets were prepared, each requiring 4 batteries to power them. It was estimated that only 75% of the headsets would be in use at any given time. However, due to a mistake, the technicians prepared a newer headset model that requires 6 batteries each, while still assuming that only 75% of them would be used simultaneously. How many additional batteries are needed to meet the estimated demand compared to before?