You are planning to save enough to retire in 40 years. To do this, you will invest $1,000 at the end of each month in a stock account and $500 at the end of each month in a bond account. The stock account is expected to give 8% APR, compounded monthly. The bond account is expected to give 4% APR, also compounded monthly. When you retire, you will combine the two accounts and invest in an account that will earn 6% APR. How much will you withdraw from your post-retirement account every month if your withdrawal period is 25 years?