Accusoft Systems is offering small business owners a software package that keeps track of many accounting functions from bank transactions to sales invoices. The site license will cost $39,000 to install and will require a fee of $6000 every 3 months. If your company can save $13,500 every quarter and have the security of managing its books in house, how long will it take for you to recover the investment at an interest rate of 10% per quarter?