A manager buys three shares of stock today, and then sells one of those shares 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 Price $ 130 150 Action Buy 3 shares Sell 1 share Sell 1 share Sell 1 share 150 150 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 return 488 % b. Calculate the time weighted arithmetic average return on this portfolio (Do not round intermediate calculations. Round your answer to 2 decimal places.) Arithmetic average return 512 c. Calculate the dollar-weighted average return on this portfolio. (Do not round Intermediate calculations. Round your answer to 2 decimal places.) Dollar-weighted average return %