Karma scribbled on her paper furiously. Those Gryffindors really needed to put a cauldron in it.

"Honestly," she hissed as a fellow Gryffindor told them to hush.

After using the calculator, she figured it out, and proudly raised her hand.

"Professor, one hundred US dollars in Wizarding money is 20 galleons, 13 sickles and 17 knuts, sir."