You are planning to start your business. Your aunt will lend you the money if you agree to pay him back within 4 years, and you offer to pay him the rate of interest that she would otherwise get by putting his money in a savings account. Based on your earnings and living expenses, you think you will be able to pay her $5,000 in one year, and then $8,000 each year for the next 3 years. If your aunt would otherwise earn 6% per year on her savings, how much can you borrow from her? (Please indicate your result with two decimal places. Example: 20643.98)