is it possible to get assistance with this for Lyondellbasell? Please let me know if i am missing anything that could potentially help. I believe the WACC was 6.69% for 2020

- Estimate the firm's before-tax and after-tax component cost of debt; (Note: If the information about the current corporate tax rate is not available, you need to estimate the tax rate based on the historical tax payments).

- Estimate the firm's component cost of preferred stock if the firm has issued preferred stocks.

- Use three approaches (CAPM, DCF, bond-yield-plus-risk-premium) to estimate the component cost of common equity for the firm.

- Calculate the firm's weighted average cost of capital (WACC) using the market-based capital structure weights.