8. The IWF ETF price and dividend history are as follows: An investor buys ten shares of IWF at the beginning of 2018, sells five shares at the beginning of 2019, buys ten more shares at the beginning of 2020 , buys ten more shates at the beginning of 2021 , and sells all remaining. shares at the beginning of 2022 . What ate the arithmetic, geometric, and dollar-weighted average returns?.