Problem 11-9 Using Dollar Cost Averaging [LO5] For four years, Marle invested $4,200 each year in a bank's stocks. The stocks sold for $43 in 20X1, $51 in 20X2, $42 in 20X3, and $56 In 20X4. a. What is Marie's total investment in this bank? (Omit the "$" sign in your response.) Total investment b. After four years, how many shares does Marie own? (Round your intermediate calculations DOWN and round your final answer DOWN to the nearest whole share.) Total number of shares c. What is the average cost per share of Marie's investment? (Round DOWN your intermediate calculations to the nearest whole share. Round your final answer to 2 decimal places. Omit the "$" sign in your response.) Average cost per share $