The following three defense stocks are to be combined into a stock index in January 2016 (perhaps a portfolio manager believes these stocks are an appropriate benchmark for his or her performance): Price Shares (millions) 1/1/16 1/1/17 1/1/18 Douglas McDonnell 350 $ 65 $ 69 $ 81 Dynamics General 450 25 19 33 International Rockwell 210 54 43 57 a. Calculate the initial value of the index if a price-weighting scheme is used. b. What is the rate of return on this index for the year ending December 31, 2016