The standard deviation of the market index portfolio is 20%. stock a

The standard deviation of the market index portfolio is 20%. Stock A has a beta of 1.5 and a residual standard deviation of 30%.

a) What would make for a larger increase in the stock’s variance: an increase of .15 in its beta or an increase of 3% in its residual standard deviation?

b) An investor who currently holds the market-index portfolio decides to reduce the portfolio allocation to the market index to 90%, and to incest in stock A. Which of the changes in (a) will have a greater impact on the portfolio’s standard deviation?

Please do not copy answer from solutions manual, as it isn’t good enough. I need step by step solution. Thank you!

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