An investor buys three shares of XYZ at the beginning of 2018, buys another two shares at the beginning of 2019 , sells one share at the beginning of 2020 and sells all four remaining shares at the beginning of 2021 a. What are the arthmetic and geometric average time-weighted rates of retum for the investor? (Round your year-by-year rates of return and final onswers to 2 decimal places. Do not round other calculations.) Answer is complete but not entirely correct