: STK Inc., who is taxed at $$0\mathrm{.}20$ of every dollar earned, has a debt$-$to$-$equity ratio of $1/5,$ where its equity totals $$1,200,000-$ debt and equity investors require $8\mathrm{.}5\%$ and $9\mathrm{.}75\%,$ respectively; what is YSJ Inc.s WACC, and how are your computations impacted if the D$/$E is lowered to $15\%($show all your work$)?$