The capital structure for BlueScope Steel $($BSL$)$ is $90\%$ equity and $10\%$ debt. Its cost of equity is currently Re $=10\mathrm{.}4\%$

and its before$-$tax cost of debt is Rd $=7\mathrm{.}5\%$

$.$ What is the cost of equity for an unlisted steel manufacturer with very similar assets to those of BSL and a debt$-$to$-$equity ratio of D$/$e $=0\mathrm{.}21,$ if its cost of debt is the same as BSC$\text{'}$s cost of debt? $($Express your answer as a number rounded to four decimal places. For example, if the return on equity is $12\mathrm{.}345\%,$ you should enter $0\mathrm{.}1235$ as your answer.$)$