A stock has an expected return of $0\mathrm{.}1,$ its beta is $0\mathrm{.}68,$ and the expected return on the market is $0\mathrm{.}07.$ What must the risk$-$free rate be$?($Hint: Use CAPM$)$ Enter the answer in $4$ decimals e$.$g$.0\mathrm{.}0123.$