You are receiving an annuity payment of $320 every month on the first of the month. You do not need the money, so you have decided to invest it every month. You do this until the annuity expires in 22 years. On Day 1, you also made a starting contribution in the amount of $4,800. If you earned 4% as a long-term growth rate, what was the value of your investment portfolio in 22 years?