Over a four-year period, Lakeisha Thompson purchased shares in the Oakmark Investor Class Fund. Using dollar cost averaging, calculate the number of shares before completing this problem. (Round your answers to the nearest whole number.) Year February 2017 February 2018 Investment Amount Price per Share Number of Shares $ 3,700 $ 51.00 $ 3,700 $ 32.00 February 2019 $ 3,700 $ 45.40 February 2020 $ 3,700 $ 53.00 a. At the end of four years, what is the total amount invested? Total investment b. At the end of four years, what is the total number of shares purchased? (Round your intermediate calculations and final answer to the nearest whole number.) Total number of shares c. At the end of four years, what is the average cost for each share? (Round your intermediate calculations to the nearest whole number. Round final answer to 2 decimal places.) Average cost