How long would it take to recover and investment of $250,000 in enhanced CNC controls that include axis control to eight axes on the milling model, if the associated income is $80,000 per year, expense is $40,000 per year, and salvage is $180,000 at end of first year and decreases by $2,0,000 every year after year one. MARR=6%. Hint: Payback period is between 4 and 8 years