A company is considering the purchase of a new machine for $63,000. Management predicts that the machine can produce sales of $17,500 each year for the next 10 years. Expenses are expected to include direct materials, direct labor, and factory overhead totaling $6,500 per year including depreciation of $5,500 per year. Income tax expense is $4,400 per year based on a tax rate of 40%. What is the payback period for the new machine