Booher Book Stores has a beta of 1.64. The yield on a 3-month T-bill is 4.90% and the yield on a 10-year T-bond is 9.15%. The market risk premium is 4.90%. What is the estimated cost of common equity using the CAPM? a). 13.06 b). 13.41 c). 18.05 d). 19.59% e). 17.19%