In public money (such as national lottery and Londen Development centre) the budget was firstly £2,000,000 however, because of security reasons mostly, it was raised to £12,000,000 and is rising to £14,000,000. However in private money (government money) £35 Billion.
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It is estimated to cost $15 billion though this is likely to be an underestimate. The original budget was $5 billion
For the taxpayers of the UK, very little if anything. For those companies that promoted, built and serviced the Olympics, many millions.