AJ had $77. They purchased a sleeping bag for $99. Represent how much money AJ now has.
AJ now has $77 - $99 = $<<77-99=-22>>-22. Answer: \boxed{-22}.
To represent how much money AJ now has, we need to subtract the cost of the sleeping bag from the initial amount AJ had.
$77 - $99 = -$22
So, AJ now has -$22.