According to Chelsea writer/journalist Dan Levene of the Fulham Chronicle, it cost Chelsea a combined £28m to buy out Carlo Ancelotti and bring in the now fired Andre Villas-Boas.
Villas-Boas' contract was worth £14m over three years and Chelsea will probably pay him most, if not all, of that money. That means that Chelsea's last two managerial hirings and firings have cost them in the neighborhood of £42m
Pretty sure AVB can't believe his luck. Free of Chelsea, and got a massive payout to relax for a few months before searching for a new post with a more understanding owner.