an investment fund has a value of 900 at the beginning of the year

An investment fund has a value of $900 at the beginning of the year. A deposit of $30 is made at the end of 3 months, a withdrawal of SSO is made at the end of 7 months, and a deposit of $ 70 is made at the end of 10 months Find the dollar-weighted rate of return if the balance at the end of the year is $992.93