The expected constant-growth rate of dividends is % for a stock currently priced at $79, that just paid a dividend of $4, and has a required return of 18%? You want to construct a portfolio containing equal amounts of U.S. Treasury bills, stock A, and stock B. If the beta of the stock A is 1.62 and the beta of the portfolio is 0.98, what does the beta of stock B have to be?