please show work

Problem 1:

Assume the expected return for Exxon is 14% and that of Walmart is 23%. You have 40% of your stock invested in Exxon and 60% invested in Walmart. Assume the annual standard deviation of returns is 35% for Exxon and 54% for Walmart. The correlation between Intel and ATP is 0.25.

• What is the expected return of your portfolio?
• What is the standard deviation for the portfolio?

Problem 2:

Suppose the market portfolio tends to increase by 36% when the economy is strong and decline by 17% when the economy is weak. A stock's return is 47% on average when the economy is strong and 20% when the economy is weak. Calculate the beta of the stock.