An investor is considering purchasing two stocks for a portfolio. Both stocks will have equal weighting in the portfolio. It is expected that three economic states may occur, each with equal probability of occurring. If a boom economy transpires, stock A will yield a 20% return and stock B 10%. An average economy will see a 10% and 5% returns for stocks A and B respectively. In a bust economy, stock A will have a return of -5% and stock B 1%. Given the above information, calculate the standard deviations of each stock along with the portfolio.