The return on the market is $9\mathrm{.}0\%$ and the risk$-$free rate is $2\mathrm{.}5\%.$ The investor is conservative and his beta $()$ is $0\mathrm{.}80.$

a$)$ What is the required rate of return for this investment using the CAPM approach?

b$)$ What if the $()$ is $1\mathrm{.}85,$ but the risk$-$free rate is $5\%$ and the market return is $10\mathrm{.}5\%?$ What is the required rate of return for this investment?

SHOW WORK IN EXCEL.