Your grandfather made an investment of $4,000 the day you were born, as such starting to earn returns immediately. His assumption is that by investing in the average market, the investment account will earn an annual rate of 6%, which is a historical average. He will continue to make 18 more annual $1,500 deposits into this account for you, assuming you will earn the average 6% every year.
Based on the above assumptions, what will be the balance of this account after the initial investment and the 18 annual returns earning the hypothetical 6%?