I have a question.

$600000 as a down payment to buy a flat, A plans to make 36 regular monthly deposits into his SA paying an int.rate of 4.5% p.a. compounded monthly at the end of each month.1)What is the required amount of each deposit ?2)Suppose that immediately after the 15th payment has been made, he decided to stop his saving plan and would like to have four equal withdraws from his account in the next four months. Compute the amount of equal withdrawals.3)Calculate the total interest earned ?answer detail.