Wendel invests 5000 dollars in a mutual fund on January 1. On June 1, his fund balance is 3400 dollars. Wendel notices the decline, and withdraws 1400 dollars. On September 1, his fund balance is 8200 dollars, and he then invests an additional 1100 dollars. On the following January 1, his fund balance is 6700 dollars. What is Wendel's time-weighted rate of return? Answer = percent.