Answer:
a. Number of shares of GoldFinger = 61%*400000/24
Number of shares of GoldFinger = 10166.6667
Number of shares of Moosehead = 24%*400,000/73
Number of shares of Moosehead = 1315.0685
Number of shares of Venture Associates = (1 - 61% - 24%) * 400,000/9
Number of shares of Venture Associates = 15% * 400,000/9
Number of shares of Venture Associates = 6666.6667
New value of the portfolio = 10166.6667*$43 + 1315.0685*$67 + 6666.6667*$6
New value of the portfolio = $437,166.6681 + $88,109.5895 + $40000.0002
New value of the portfolio = $565,276.2578
b. The return that the portfolio earn is = ($565,276.2578 - $400,000) / $400,000 = $165,276.2578 / $400,000 = 0.4131906445 = 41.32%
c. Weight of Goldfinger is now = (10166.6667*$43) / $565,276.2578
= $437166.6681 / $565,276.2578
= 0.7734
= 77.34%
Weight of Moosehead is now = (1315.0685*$67) / $565,276.2578
= $88109.5895 / $565,276.2578
= 0.15587
= 15.59%
Weight of Venture is now = 100% - 77.34 - 15.59%
= 7.07%