Please show work and explain step by step so I can work more problems like this one. Thank you :)

Ch 08: Assignment - Risk and Rates of Return A collection of financial assets and securities is referred to as a portfolio. Most individuals and institutions invest in a portfolio, making portfolio risk analysis an integral part of the field of finance. Just like stand-alone assets and securities, portfolios are also exposed to risk. Portfolio risk refers to the possibility that an investment portfolio will not generate the investor's expected rate of return. Analyzing portfolio risk and return involves the understanding of expected returns from a portfolio. Consider the following case: Andre is an amateur investor who holds a small portfolio consisting of only four stocks. The stock holdings in his portfolio are shown in the following table: Stock Percentage of Portfolio Expected Return Standard Deviation Artemis Inc. 20% 6.00% 31.00% Babish & Co. 30% 14.00% 35.00% Cornell Industries 35% 11.00% 38.00% Danforth Motors 15% 3.00% 40.00% What is the expected return on Andre's stock portfolio? O 13.10% 7.28% 14.55% O 9.70%