Javier had $305 in his bank account. His bank charges a fee of $7.50 each month that a balance is below $500.

If he makes no other deposits or withdrawals, how much money is in Javier’s account at the end of three months?

At the end of the first month, Javier's account balance will be $305 - $7.50 = $<<305-7.5=297.5>>297.50.

At the end of the second month, his account balance will be $297.50 - $7.50 = $<<297.5-7.5=290.00>>290.00.
At the end of the third month, his account balance will be $290.00 - $7.50 = $<<290-7.5=282.50>>282.50. Answer: \boxed{282.50}.