As we know, dollar-weighted average return is a more accurate way to measure security return performance if we buy or sell securities from time to time. Suppose you have the following price information for a risky security for several recent years. Assume that the stock pays no dividends

Year	Beginning of year price	# of share bought or sold
2017	$50	100 bought
2018	$55	50 bought
2019	$51	75 sold
2020	$54	75 sold

What is the dollar-weighted average return over the entire trading period?