A manager buys three shares of stock today, and then sells one of those shores each year for the next 3 years. His actions and the price history of the stock are summarized below. The stock pays no dividends. Time 0 Price $ 170 200 200 200 Action Buy 3 shares Sell I share Sell I share Sell i share 2 3 a. Calculate the time-weighted geometric average return on this portfolio (Do not round Intermediate calculations. Round your answer to 2 decimal places.) Geometric average retum b. Calculate the time-weighted arithmetic average return on this portfolio. (Do not round Intermediate calculations. Round your answer to 2 decimal places.) Anthmetic average retum c. Calculate the dollar-weighted average return on this portfolio. (Do not round Intermediate calculations. Round your answer to 2 decimal places.) Dolar-weighted average return X