A company is considering the purchase of a new machine for $49,000. Management predicts that the machine can produce sales of $16,100 each year for the next 10 years. Expenses are expected to include direct materials, direct labor, and factory overhead totaling $7,900 per year including depreciation of $4,100 per year. Income tax expense is $3,280 per year based on a tax rate of 40%. What is the payback period for the new machine?