The US bank Citigroup credited a client’s account with $81tn when it meant to send $280 – before the “fat finger” error was caught.The mistake was spotted only after two employees had missed it, and a third employee rectified it 90 minutes after it was posted, the Financial Times reported. No funds left the bank.The bank disclosed the “near miss” to the US Federal Reserve and the Office of the Comptroller of the Currency.A transaction of $81tn (£64tn) would be so huge that it would be unlikely t...