please explain by steps. don't use Excel functions please

Question 12.05 At the beginning of the year, an investment fund was established with an initial deposit of 1,000. Three months later, a deposit of 1,200 was made. Withdrawals of 300 and 600 were made at the end of 6 months and 8 months, respectively. The balance in the fund at the end of the year was 1,400. Calculate the dollar-weighted (money-weighted yield rate earned by the fund during the year. A 5.7% B 5.9% C 6.1% D 6.3% E 6.5%