If share C has a beta of $1,3$; the risk$-$free rate is $8\%$ and market risk premium is $7\%,$ what would the associated cost of equity be$?$ a$.21\mathrm{.}6\%$ b$.17\mathrm{.}1\%$ c$.24\mathrm{.}2\%$ d$.10\mathrm{.}4\%$