After paying the phone bill you will have $800 on your current balance, After adding fuel you will have $740 on your current balance, after gas bill you will have $440 on your current balance, Then when you deposit into your account I’m pretty sure it’s debit since your adding money so maybe change $30 for the adding money into your account into the debit section, Then for your final current balance you will have $470.
(I hope I make sense if you have any questions ask me in the comments)