You want to be able to withdraw $8500 from an account at the end of each 6-month period (that is, twice a year) for the next 10 years. How much money should you invest now into an account earning 5.5% 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. The amount to invest now is dollars. Do NOT use the dollar sign in the answer box