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A machine's initial maintenance costs are covered by a 3-year warranty. Its initial installed cost is $22,000. Salvage value in any year is zero. Assume a 10% interest rate and ignore income taxes. Annual maintenance Year None 1-3 4-5 $6500 6 $2500 7-10 +$3500/yr (a) Compute the economic life with the lowest EUAC. (b) How does the economic life and minimum EUAC change if an overhaul costing $8000 at the end of year 5 is required for lives of 6 years or greater