please use this formula

tofund the Wacc

wacc=d/(d+e) *R d *(1-tax) + e/d+e* R e

R e= Rf+ beta of equity*( Erm-Rf)

The market value of equity of Bobo Real Estate Company is $6 million, and the total market value of debt is $4 million. The beta of the stock is currently 1.5. The market portfolio risk premium is 10% and the yield on T-bill is 5% while the yield on T-bonds is 8%. If the beta for debt is approximately zero, Bobo's WACC cannot exceed: A. Need more information to decide. B. 11% C. 17%. D. 13.8% E. 18%