You invested $210,000 on 1/1/2017. Unfortunately, the economy declined, and your investment was valued at $165,000 on 12/31/2017. The economy started improving in the next three years and your investment at the end of year 2018 , 2019 , and 2020 was re-valued at $175,000,$290,000 and $280000, respectively. (Assume thaf during this time you did not re-allocate or withdraw from your investments) Calculate the geometric mean rate of return for this investment