Tim's portfolio contains two stocks, Lightco and Shineco. Last year his portfolio returned 14 percent. lightco's return was 5 percent and Shineco returned 20 percent. what are the weights of each in Tim's portfolio.
The following year Tim adds a third stock, Brightco, and relocates his funds among the three stocks. Lightco and Shineco have the same weight in the portfolio, and Brightco's weight is one -half of Lightco. During the year Lightco returns 10 percent, shineco returns 12 percent, and brightco loses 5 percent. what was the return on his portfolio?