Answer: You can withdraw $4.50 and still have free checking.
Explanation:
If there's $849.50 in your checking account before you withdraw $45, subtract the amounts.
849.50 - 45.00 = 804.50
Since you will need at least $800 to have free checking, subtract the remaining balance in your account.
804.50 - 800.00 = 4.50
So the maximum amount you could withdraw would be $4.50.
-Just An Average 6th Grader- :)