"I don't know how much it's going to be," Hermione mentioned. But she scooped up another couple of handfuls of galleons anyway and dropped them into the small bag she was holding. Handing it to Ron, she gave a slight shrug. "I think that should cover everything."
Pausing, it occurred to her that she may never have actually told him that she had another account of her own. "You do know that I have a Muggle bank account as well as one here, don't you?" It negated the need for the fiddly process of currency exchange.