29. The S&P 500 showed the following TRs for a 6 year period: 11.1 percent,-5.2 percent, 20.3 percent, 26.7 percent, -12.4 percent, and 2.2 percent. (a) (b) (c) (d) Calculate the arithmetic mean return for the 6 year period. Calculate the geometric mean return for the 6 year period. Which measure is best for forecasting next year's return? What is your best estimate of the value of a $1000 investment in five (5) years