c$.$ AT&T closed at $$30\mathrm{.}85$ on February $20,2019,$ the date the Form $10-K$ was filed with the SEC. How does your valuation estimate compare with this closing price

d$.$ If WACC has been $6\mathrm{.}2\%,$ what would the valuation estimate have been?

What about if WACC has been $5\mathrm{.}2\%?$