The company "Accusoft Systems" offers business owners a software package that maintains the records of many accounting functions from sales bills through bank transactions. The site license costs $ 22,000 per installation concept and involves a fee of $ 2,000 per quarter. If some small company could save $ 3.500 each quarter to security to manage their books at home, how long will it take for the company to recover its investment with an interest rate of 4% per quarter?