Gretchen invests 5400 dollars in a mutual fund on January 1. On March 1, she learns that her fund balance is 3600 dollars, and she then withdraws 1100 dollars. On August 1, her fund balance is 8600 dollars, and she then deposits 1500 dollars. On the following January 1, her fund balance is 7100 dollars. What is Gretchen's dollar-weighted rate of return? (Assume simple interest and months of equal length.)
Answer = percent.