Harold Rawlings has computed the returns he earned last year from each of the stocks he holds in his portfolio. The individual returns and the amounts he had invested in each stock at the beginning of the year are shown in the following table:

     Stock      Return     Amount Invested

     At&t       22.5%       $4,200

     GM         12.3           5,520

     Danka   -44.7          2,200

   Suiza Foods 100.0        3,080

a. Compute the return that Harold earned on his portfolio during the year.

b. Harold has decided to keep Danka in his portfolio, even though it has experienced financial difficulties and performed very poorly last year, because he expects a significant turnaround that will generate a 25% return next year. Suppose that Harold is correct. Assuming that the returns from the other stocks remain the same as last year, compute the return on the portfolio for next year. (Hint: The portfolio weights for the stocks change based on the returns earned last year, so the values of the stock at the end of the year should be used to compute the new weights.)