I know how to calculate CAPM required return. but how about the valuation, It's overvalued or undervalued ?

Patricia Franklin makes buy and sell stock recommendations using the capital asset pricing model. Franklin has derived the following information for the broad market and for the stock of the CostSave Company (CS) 5% 5% 1.50 Expected market risk premium GRisk-free rate Historical beta for CostSave Franklin believes that historical betas do not provide good forecasts of future beta, and therefore uses the following formula to forecast beta: forecasted beta = 0.80 + 0.20 x historical beta After conducting a thorough examination of market trends and the CS financial statements. Franklin predicts that the CS return will equal 10%. Franklin should derive the following required return for CS along with the following valuation decision (undervalued or overvalued) Valuation A. overvalued B. overvalued CAPM required return 83% 13.8%