10. The balance of an investment fund at the beginning of the year and at the end of the year is $20,000 and $26,000, respectively. A withdrawal of $2,000 was madeat the end of 5 months. A deposit of K was made at the end of 6 months, and another deposit of 2K was made at the end of 9 months. The dollar-weighted rate of interest earned by the fund over the year is 8%. Determine K.