A little help please.

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 1 2 3 Price $ 135 165 165 165 Action Buy 3 shares Sell 1 share Sell 1 share Sell 1 share 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 relum 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 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 %