I don't know how they got p12 and from there I need to calculate the variance. Thank you!

0% We use the following data: Scenario Probability Return Ki Return K2 wi (recession) 0.4 -10% 20% wy (stagnation) 0.2 20% ws (boom) 0.4 20% 10% We want to compare the risk of a portfolio such that w1 = 40% and uy = 60% with the risks of its components as measured by the variance. Direct computations give 0 0.0184, o 0.0024, P12 -0.96309