Please Assist in this multi-step problem. I have been at this all day... provide somewhat of a coherent explanation please.

(Solving a comprehensive problem) Use the end-of-year stock price data in the popup window, a , 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 rms. 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 rm pays any dividends.) c. Compute a three-year rate of return spanning the entire period (i.e., using the ending price for period 1 and ending price for period 4). d. Since the rate of return calculated in part c is a three-year rate of return, convert it to an annual rate of return by using the following equation: