Straightforward situational question

[kingofmirrors]

8 player game, 7 remain. Starting stack is $22.50 and you have $18, BB has $20. Blinds are $0.40/$0.80 and next hand will be raised to $0.60/$1.20. You are UTG with AKo and raise to $2.50, the table folds to the BB who raises to $8.50. You know the BB generally has pretty loose starting hand raising requirements but isn't super aggressive and doesn't come over the top often. What's the play?