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			Action
0	$	150		Buy 3 shares
1		180		Sell 1 share
2		180		Sell 1 share
3		180		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.)

b. Calculate the time-weighted arithmetic average return on this portfolio. (Do not round intermediate calculations. Round your answer to 2 decimal places.)

c. Calculate the dollar-weighted average return on this portfolio. (Do not round intermediate calculations. Round your answer to 2 decimal places.)