AJ owns a portfolio that has a value of $300,000 and consists of only 3 stocks. He has $60,000 worth of stock A, which has a beta of 1.25; he has 8,000 shares of stock B, which has a share price of $22.50 and a beta of -0.05; and he has some stock C, which has a beta of 0.9. What is the beta of AJ's portfolio?