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). Suppose that Douglas McDonnell shareholders approve a 3-for-1 stock split on January 1, 2020. Price Douglas McDonnell Dynamics General International Rockwell Shares (millions) 355 455 270 1/1/19 $ 86 55 84 1/1/20 $ 91 52 73 1/1/21 $103 66 87 a. What is the new divisor for the index? (Do not round intermediate calculations. Round your answer to 3 decimal places.) New divisor b. Calculate the rate of return on the index for the year ending December 31, 2020, if Douglas McDonnell's share price on January 1, 2021, is $32.40 per share. (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places.) Rate of return %