Petra looked at the turnstiles, and was amazed; that they would have these in the wizarding world, but do you have to pay for everthing when magic can just fix it. Shrugging her shoulders she turned around and went back to her dorm and got the right amount of sickels and skipped back to the turnstiles and put the money in the correct slot. Knowing she would be back to the potions lab she had to remind herself to carry a bit of extra change on her.