The Clip Joint operates four barber's chairs in the student centre. During the week before semester break and the week before graduation, the Clip Joint experiences peak demands. Military-style haircuts take 5 minutes each, and other styles require 20 minutes each. Operating from 9 a.m. to 6 p.m. on the six days before semester break, the Clip Joint completes 500 military-style haircuts and 400 other haircuts. During a comparable six-day week before graduation, the Clip Joint completes 700 military-style haircuts and 300 other haircuts. In which week is utilization higher? (Assume that each barber is able to work continuously throughout the 9-hour day.)