You can purchase an optical scanner today for $$440.$ The scanner provides benefits worth $$80$ a year. The expected life of the scanner

is $10$ years. Scanners are expected to decrease in price by $30\%$ per year. Suppose the discount rate is $14\%.$ When is the best time to

purchase the scanner? $($Round your answer to the nearest cent.$)$

NPV is maximized when you wait $0,{}_{?}$ years to purchase the scanner. At

this date NPV will be equivalent to today.