Companies be tax rate is $25\%$ is beta is $1\mathrm{.}8$ and it uses no debt however the CFO is considering moving to a capital of structure with $25\%$ debt and $75\%$ equity if the risk free rate is $6\%$ in the market risk premium is $6\mathrm{.}5\%$ how much would the capital structure shift changed the firms cost of equity what is RL minus RU