You own three$$ stocks: $600$ shares of Apple$$ Computer, $10$ comma $000$ shares of Cisco$$ Systems, and $5$ comma $000$ shares of$$ Colgate$-$Palmolive. The current share prices and expected returns of$$ Apple, Cisco, and$$ Colgate$-$Palmolive are,$$ respectively, $ $480,$ $ $20,$ $ $93$ and $12\%,10\%,8\%.$

a$.$ What are the portfolio weights of the three stocks in your$$ portfolio?

b$.$ What is the expected return of your$$ portfolio?

c$.$ Suppose the price of Apple stock goes up by $ $23,$ Cisco rises by $ $6,$ and$$ Colgate$-$Palmolive falls by $ $16.$ What are the new portfolio$$ weights?

d$.$ Assuming the$$ stocks' expected returns remain the$$ same, what is the expected return of the portfolio at the new$$ prices?