50% or Residents and Buildings with Access

My question is in regards to the 50% requirement of residents and the # of weekday trips. Lets pretend that 25% of my residents have access to 3 stops which accounts for 30 weekday trips and the other 25% of my residents only have access to 1 stop which accounts for another 30 weekday trips totaling 60-weekday trips for 1-point. Do all 50%+ of my residents have to have access to all 4 stops in order to count for the 60 weekday trips or are the trips themselves an aggregate and at least 50% of residents need access to at least 1-stop? Thanks You!