Over a four-year period, Lakeisha Thompson purchased shares in the Oakmark I Fund. Using the following information, answer the questions that follow. You may want to review the concept of dollar cost averaging in Chapter 12 before completing this problem. (Round your answers to 2 decimal places.) Years Investment Amount Price per Share Number of Shares February 2011 $3,900 $52.00 February 2012 $3,900 $33.00 February 2013 $3,900 $46.40 February 2014 $3,900 $54.00 to z decim 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 2 decimal places.) Total shares c. At the end of four years, what is the average cost for each share? (Round your intermediate calculations and final answer to 2 decimal places.) Average cost