-10. (Solving a comprehensive problem) Use the following end-of-year price data to answer the following questions for the Harris and Pinwheel companies. a. Compute the annual rates of return for each time period and for both firms. b. Calculate both the arithmetic and the geometric mean rates of return for the entire three-year period using your annual rates of return from part a. (Note: You may assume that neither firm pays any dividends.) c. Compute a three-year rate of return spanning the entire period (i.e., using the beginning price for Period 1 and ending price for Period 4)