At the beginning of the year an investment fund was established with an initial deposit of $1,000. A new deposit of $500 was made at the end of four months. Withdrawals of $200 and $100 were made at the end of six months and eight months, respectively. The amount in the fund at the end of the year is $1,272. Find the approximate effective rate of interest earned by the fund during the year using the dollar-weighted rate of return formula.

please solve it without table and excal