New Philadelphia GameStop Policy Requires Customer Fingerprints When Trading In Games

[kitler53]

Teeqoz said:

kitler53 said:
and trade ins drop by over 3000% overnight.

How can something drop more than 100% (I understand it was a joke, but it's mathematically impossible)? Do they get negative trade ins?

http://www.percent-change.com/index.php?y1=100&y2=-2900