On December 15th, 2016, a House of Representatives and Senate Conference Committee released a unified version of the Tax Cuts and Jobs Act (TCJA). The plan reduced the corporate income tax rate from 35% to 21%. On December 31st, 2016, the market values of DuPont’s common stock, preferred stock, and debt were $30,860 million, $187 million, and $9543 million, respectively. The cost of equity capital, cost of preferred stock capital, and the pre-tax cost of debt capital are 11.22%, 5.25%, and 3.66%, respectively.

What is DuPont’s WACC in 2017?