Problem #6: You are planning to save for retirement after 30 years. To do this, you will invest $900 at the end of each month from now in a stock account and also $400 at the end of each month in a bond account. The stock account is expected to give 8% APR (compounded monthly) and the bond account 4% APR (also, monthly compounded). When you retire, you will combine the two accounts and invest in an account that will earn a 6% APR. How much will you withdraw from your post-retirement account every month if your withdrawal period is 25 years? Problem #7