Stock X has a 10% expected return, a beta coefficient of 0.9, and a 35% standard deviation of expected returns. Stock Y has a 12.5% expected return, a beta coefficient of 1.2 and a 25% standard deviation. The risk-free rate is 6%, and the market risk premium is 5%.

(a) Calculate each stock's coefficiet of variation.

(b) Which stock is riskier for a diversified investor?

(c) Calculate each stock's required rate of return.

(d) On the basis of the two stock's expected and required returns, which stock would be more attractive to a diversified investor?

(e) Calculate the required return of a portfolio that has $7,500 invested in Stock X and $2,500 invested in Stock Y.

(f) If the market risk premium increased to 6%, which of the two stocks would have the larger increase in its required return?