I know what the answers are, I'm needing help figuring out the work. Please, no excel.

Use this info for the next two problems. State Probability Boom .70 Bust .30 Return on A 15% 10% Return on B 8% 6% Return on C 4% -2% 20. What is the expected return of a portfolio with 20% of the funds invested in A and the rest evenly divided between B and C?| A. 5.76% B. 6.12% C. 6.54% D. 7.30% E.7.60% 21. What is the standard deviation of a portfolio with 20% of the funds invested in A and the rest evenly divided between B and C? A. 1.64 B. 1.72 C. 1.92 D. 2.06 E. 2.41