John invests 1540 dollars in a mutual fund on January 1. On February 1, his fund balance is 1620 dollars, and he invests an additional 1040 dollars. On May 1, his fund balance is 2060 dollars, and he withdraws 618 dollars. On August 1, his fund balance is 1662 dollars, and he withdraws another 166.20 dollars. On the following January 1, his fund balance is 1595.80 dollars. What is John's time-weighted rate of return? Answer =