You can purchase an optical scanner today for $500. The scanner provides benefits worth $80 a year. The expected life of the scanner is 10 years. Scanners are expected to decrease in price by 20% per year. Suppose the discount rate is 12%. When is the best time to purchase the scanner? (Round your answer to the nearest cent.)

NPV is maximized when you wait ____ (choose from 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10) years to purchase the scanner. At this date NPV will be equivalent to $____ today.