$16-AJo-in BB
 

PokerStars Tournament, Big Blind is t20 (8 handed) Converter on pregopoker.com

UTG (t1500)
UTG+1 (t1500)
MP1 (t1420)
MP2 (t1650)
CO (t1470)
Button (t1370)
SB (t1590)
Hero (t3000)

Preflop: Hero is in BB with A[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/spade.gif[/img]
<font color="gray">UTG folds</font>, <font color="gray">UTG+1 folds</font>, MP1 calls t20, MP2 calls t20, CO calls t20, Button calls t20, SB calls t10, Hero checks

Flop: (t120) 9[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/heart.gif[/img] (6 players)
SB checks, <font color="red">Hero bets t100</font>, <font color="gray">MP1 folds</font>, <font color="gray">MP2 folds</font>, <font color="gray">CO folds</font>, <font color="red">Button raises to t340</font>, <font color="gray">SB folds</font>, <font color="gray">Hero?</font>

Re: $16-AJo-in BB
 

So read dependent, but I would fold this since it's early. You could sharkscope and shove if he's really bad. AT is really the only hand he is raising then you are beating vs an unknown.
Also, you really don't need to bet so much on the flop, it's not too draw heavy so 80 or so is much better.