A small accounting firm is considering the purchase of a computer software package that would greatly reduce the amount of time needed to prepare tax forms. The software costs $1600 and this expense will be incurred immediately. The firm estimates that it will save $525 at the end of each year beginning in one year for 9 consecutive years, and also save $1444 in year 10. What is the payback on the computer package?
Place your answer as an integer that stands for number of years.