You are planning to save for retirement over the next 25 years. To do this, you will invest $790 per month in a stock account and $390 per month in a bond account. The return of the stock account is expected to be an APR of 9.9 percent, and the bond account will earn an APR of 5.9 percent. When you retire, you will combine your money into an account with an APR of 6.9 percent. All interest rates are compounded monthly.