In 2020, the market values of DuPonts common stock, preferred stock, and debt were $30,860 million, $187 million, and $9543 million, respectively. Its total value was, therefore, $30,860 million + $187 million + $9543 million = $40,590. Given the costs of common stock, preferred stock, and debt we have already computed, DuPonts WACC in 2020 was: