Answer:
Risk premiums = Alpha A x Risk Premium
S&P Portfolio Risk premiums = 3 x 5% = 15%
Hedge Fund Portfolio Risk premiums = 3 x 10% = 30%
SDs = Sd x √(A)
S&P Portfolio = 20% x √(3) = 34.64%
Hedge Fund Portfolio = 35% x √(3) = 60.62%
Sharpe ratios = Risk premium / SDs
S&P Portfolio = 15% / 34.64% = 0.43
Hedge Fund = 30% / 60.62% = 0.49