I got beta for 3 which is 1.466, but a bit confused with 4.

3. Boggs Sports Holdings has a total investment of $500 million in five companies: INVESTMENT (IN BETA MILLIONS) $130 0.3 $160 1.5 Company A Company B Company C Company D $70 3.2 $90 2.0 Company E $50 1.0 Total $500 What is the beta of this portfolio? 4. For the portfolio described in Problem 3, if the risk-free rate is 10% and the market risk premium is 5%, what is Boggs' required rate of return