An association had a fund balance of 800$ on January 1st and 900$ on December 31st. At the end of each month during the year, the association deposited 50$ from membership fees. There were withdrawals of 200$ on April 30th, 200$ on June 30th, 100$ on September 30th and 100$ on October 15th. Calculate the dollar-weighted rate of return for the year (consider months for the interest weights).