Why 돌려줍니다 rather than 돌려져요?
돌려져요 would be the conjugation of 돌려지다, but the word return is 돌려주다 so it would be 돌려줘요. however duolingo doesn't accept that either. Cause it's still in beta I guess sometimes it won't accept other politeness forms/other correct conjugations.
Went ahead and reported for not accepting 돌려줘요.