The Arithmetic mean will be 15 160 30 20 4 1654 4125. First add 1 to each return. 15 -5 10 15 3.
Where R1 R2 and Rn are sub-period returns for period 1 2 and n respectively and.
N is the total number of sub-periods for which return is available. Year 2 115 160 260 184 115184 299. This is equivalent to raising 19500 to the 15-th power. To calculate compounding interest using the geometric mean of an investments return an investor needs to first calculate the interest in year one which is 10000 multiplied by 10 or 1000.