You want to be able to withdraw $5500 from an account at the end of each 6-month period (that is, twice a year) for the next 9 years. How much money should you invest now into an account earning 5.9% interest per year, compounded every 6 months, in order to fund the desired withdrawals? Assume the account is empty after the last withdrawal is made. Give the answer correctly to 2 decimal places