Please walk me through this problem. I created a spreadsheet to calculate problems like these. And I want to see how accurate it is. Thank you!

You will create a portfolio that invests 60% of your money in Hamburger Hut and 40% of your money in Pizza King. The expected returns for these companies depends on the economy, and are as follows: Economy Probability HamburgerHut PizzaKing Strong 25% 8% 2% Normal 50% 6% 5% Weak 25% 4% 10% What is the expected return and standard deviation of returns for your portfolio