When Warren E. Buffett invests in a troubled company, he gets a good deal. Dealbreaker’s Matt Levine crunched the numbers on Mr. Buffett’s Bank of America investment and estimates that the bank’s implied stock price in the $5 billion deal was $5.28 per share, more than $2 lower than where it currently trades. Note the way he uses less than precise assumptions to avoid getting into complications.
http://dealbreaker.com/2011/08/how-much-did-warren-buffett-pay-for-bofa-anyway/