A Corporate's WACC is 10%. The current debt-to-equity ratio is 0.25. Tax rate is 20%. The cost of debt is 4%. It is planning to change its debt-to-equity ratio to 0.5. What is the new WACC with the new debt-to-equity ratio?

A corporate's business risk (Ru) is 9% in the industry. The debt-to-equity ratio is 0.2. The cost of debt is 4%. The tax rate is 20%. What is the required return of equity (Re)?