A mutual fund manager has a $20.0 million portfolio with a beta of 1.50. The risk-free rate is 4.50%, and the market risk premium is 5.50%. The manager expects to receive an additional $5.0 million which she plans to invest in a number of stocks. After investing the additional funds, she wants the fund's required return to be 13.00%. What must the average beta of the new stocks added to the portfolio be to achieve the desired required rate of return?