At the beginning of the year, a fund was established with an initial deposit of $1,000. As of March 1, the fund had risen to $1,020 and a withdrawal of $50 was make. By July, the value of the fund was $990 and an additional deposit of $70 was make. On November 1, the value of the fund was $1,100 and a withdrawal of $120 was made. The amount in the fund as the end of the year was $1050. Calculate the time weighted yield for the fund.