average out at something

Từ điển Oxford Advanced Learner 8th

ˌaverage ˈout (at sth) derived
to result in an average amount over a period of time or when several things are considered
•The cost should average out at about £6 per person.
•Sometimes I pay, sometimes he pays— it seems to average out (= result in us paying the same amount).
Main entry: ↑average_derived