The following three defense stocks are to be combined into a stock index in January 2019 (perhaps a portfolio manager believes these stocks are an appropriate benchmark for his or her performance). Assume the index is scaled by a factor of 10 million; that is, if the total value of all firms in the market is $5 billion, the index would be quoted as 500. Douglas McDonnell Dynamics General International Rockwell Index value 2019 return 2020 return Shares (millions) 425 530 310 % 1/1/19 $72 % 50 79 Price 1/1/20 $75 a. Calculate the initial value of the index if a value-weighting scheme is used. (Round your answer to 2 decimal places.) 43 68 1/1/21 $92 b. What is the rate of return on this index for the year ending December 31, 2019? For the year ending December 31, 2020? (A negative value should be indicated by a minus sign. Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places.) 57 85