Pro-Am Audio is a company that is contracted to DJ private events. Due to a recent increase in bookings, Pro-Am is considering the purchase of another mobile DJ unit. Pro-Am uses the payback method to evaluate its investments. The mobile DJ unit will cost $12,000, has a useful life of 10 years, and will generate $2,000 in net cash inflows per year. The residual value of the unit is $1,000. What is the payback period for the mobile DJ unit?