> Two times

Hear, hear. A related annoyance is abuse of percentages: when an advert says "200% bigger", do they mean it's been doubled or trebled? place your bets, mesdames et messieurs. (I even saw "Reduces [the board area used] by 150%" in an advert about printed circuit board interfaces, which if taken literally meant said interface took up negative area.)

I'll pass over percentages per se, as that's a mathematical peeve which merely enables the aforesaid abuse by advert.