please help with this question

The following three defense stocks are to be combined into a stock index in January 2019 (perhaps a portfolio manager believes those stocks are an appropriate benchmark for his or her performance). Suppose that Douglas McDonnell shareholders approve a 2-for-1 stock split on January 1, 2020, Price Shares millions) 1/1/19 1/1/20 1/1/21 Douglas McDonnell 180 $ 60 $ 77 Dynamics General 325 68 64 78 International Rockwell 370 97 86 100 $ 64 a. What is the new divisor for the Index? (Do not round intermediate calculations. Round your answer to 3 decimal places.) Now 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 $23.42 per share. (Do not round Intermediate calculations. Enter your answer as a percent rounded to 2 decimal places.) Rate of return %