$.($Using the CAPM to find expected returns$)$

a$.$ Compute the expected rate of return for the shares of Rumi Plc$,$ which has a beta of $1\mathrm{.}46.$ The risk$-$free rate is $4$ percent, and the market portfolio $($composed of London Stock Exchange listed shares$)$ has an expected return of $10$ percent.

b$.$ Why is the rate you computed the expected rate?

not excel. thanks