Wally invests 7000 dollars in a mutual fund on January 1. On June 1, his fund balance is 3200 dollars. Wally doesn't notice the decline, and invests an additional 1100 dollars. On September 1, his fund balance is 8400 dollars. He then withdraws 1300 dollars. On the following January 1, his fund balance is 7100 dollars. What is Wally's time-weighted rate of return?
Answer = percent. ( 3 decimal place)