Katherine Wilson is wondering how much risk she must undertake to generate an acceptable return on her porfolio. The risk-free return currently is 6%. The return on the overall stock market is 12%. Use the CAPM to calculate how high the beta coefficient of Katherine's portfolio would have to be to achieve a portfolio return of 15%

The beta of the portfolio is ____ (Round to four decimal places.)

Please show how you got answer using excel formulas.