Finance help

At this point, you work with Randy Corporation and you are vigorously putting away as much money as you can for retirement. This retirement fund consists of a $5,000 investment in each of 15 different common stocks is fairly progressive companies. The portfolios beta is 1.20. Suppose you sell one of the stocks with a beta of 0.8 for $5,000 and use the proceeds to buy another stock whose beta is 1.6. Calculate your portfolios new beta. Also, interpret your results.