bank statement balance

Z’s bank statement shows a balance of $825 overdrawn. The statement includes: bank charges $509 (not in cash book), unpresented cheques $475, deposits not yet credited of $600 and wrong debit payment of $160 not related. Which one is correct?

Answer
570

Hello, I have been trying to figure out how that answer came about for awhile and I cannot figure it out. Can someone please help explain how this answer was achieved? What exactly is it asking when it asks for ‘what is correct?’ correct of what? I am not sure what it’s even asking me to calculate? So far what I know is that:

(825) overdrawn

please help, would be much appreciated?