One of your customers has a delinquent accounts payable balance. You've mutually agreed to a repayment schedule of $500 per month. You will charge 1.8 percent per month interest on the overdue balance. If the current balance is $18,000, how long will it take for the account to be paid off? Note: Do not round intermediate calculations and round your answer to 2 decimal places, e.g., 32.16. Answer is complete but not entirely correct