You are planning to save for retirement over the next 15 years. To do this, you will invest $1100 a month in a stock account and $500 a month in a bond account. The return on the stock account is expected to be 7 percent and the bond account will pay 4 percent. When you retire you will combine your money into an account with a 5 percent return. How much can you withdraw each month during retirement assuming a 20-year withdrawal period?

A) $2,636.19

B) $2,904.11

C) $3,008.21

D) $3,037.36

E) $3,406.97

When I'm trying to solve, I end up with $3,113.04 and cannot figure out where I'm wrong. Can anyone help?