With this sequence of bets you'll (a) be exposed to market losses to the extent of the money you paid for the trade, (b) get triple the index return up to 15%, (c) give up any gains above 15%.
According to the ETF Finder at ETF Channel, C and BAC collectively make up 15.62% of the iShares Dow Jones U.S. Financial Services Index Fund ETF (IYG) which is lower by about 0.9% on the day Thursday.