You are considering a lockbox system for some of your accounts receivable collections. You can program your computer to send statements with different return addresses depending on the amount of the balance. The bank charges $.75 per item for lockbox service. You can invest cash with the bank at an annual interest rate of 3.65%. It is estimated that using the lockbox would speed up collections by 5 days. What is the break-even amount-that is, the amount at which you would be indifferent as to whether a customer sent the check directly you or to the post office lockbox