You have the following information on a portfolio. You put 20% of your money in A and 80% in B. Find the expected return on your portfolio. (Ch13)

Economy	Probability	Return on A	Return on B
State 1 (Bust)	.60	5%	-10%
State 2 (Boom)	.40	30%	65%

a. 21.5%

b. 19.0%

c. 17.5%

d. 25.5%

e. 22.5%

I know the answer but I dont know how to get it, please show work in details