[Geometry... not exactly Tuuri's strong point either, but she at least has the benefit of being fresh out of mandatory math classes, so.]

Wait, okay, length of each side... So 10 by 10 by 10 would go up to 11 by 11 by 11, which means... [She maybe shouldn't be thinking through the math out loud, except it doesn't matter; she falters as she realizes she's not sure what 121 times 11 is off the top of her head.] Umm... Something like 30 percent?