Dye Industries currently uses no debt, but its new CFO is considering changing the capital structure to $40\mathrm{.}0\%$ debt by issuing bonds and using the proceeds to repurchase and retire some common stock at book value.$$ Given the data shown below, by how much would this recapitalization change the firm's cost of equity, i$.$e$.,$ what is rL $-$ rU$?$

Risk$-$free rate, rRF$6\mathrm{.}00\%$

Tax rate, T$40\%$

Market risk premium, RPM$4\mathrm{.}00\%$

Current debt ratio$0\%$

Current beta, bU $1\mathrm{.}15$

Target debt ratio$40\%$