Re: extra amount or additional amount
We understand that but the point is still that context can make a difference. If I had been telling a friend what the bank had done, I might say "Can't believe it. I took out $100 from that ATM the other day, and it took an extra $50 off my account". That would absolutely not be the way you would write it in a complaint to the bank and, when writing to the bank, I would say "additional", not "extra". So as you can see, context would have made a difference when deciding which one to use. It was sheer luck that I guessed you wanted the more formal variety and gave you a sentence to use in a letter to a bank manager.
Originally Posted by david11
Remember - correct capitalisation, punctuation and spacing make posts much easier to read.