If every employed worker in the economy retires, the labor force participation rate is 0%

100%

You cannot calculate the labor force participation rate in this case.

0% assuming the unemployment rate is also 0%.

You hold a diversified $100,000 portfolio consisting of 20 stocks with $5,000 invested in each. the portfolio's beta is 1.12. you plan to sell a stock with b = 0.90 and use the proceeds to buy a new stock with b = 1.50. what will the portfolio's new beta be? do not round your intermediate calculations.