I'm having a difficult time understanding the use of の-Adj in the JLPT N5 grammar examples and practice I've been studying and haven't found a good resource for finding the answer. The sentence is fairly simple but I can't tell what the purpose of the の at the end of the Adj is in it. It goes:
大きいのは いくらですか。 Ookii-no wa ikura desuka?
Does anybody have any clue? Thank you!