(15 points) The plant manager of Peculiar Processes has just purchased a piece of unusual machinery for $10,000. Its resale value at the end of year one is estimated to be $3,000 and it will rise at the rate of $500 per year because it is sought by antique collectors. The maintenance cost is expected to be $300 per year for each of the first three years, and then it is expected to double each year after that. Thus the fourth year maintenance is expected to be S600; the fifth year maintenance, $1,200, and so on. Based on a 15% before tax MARR, what is the economic life of this machinery? 4. Nes P-1o,00o 15 %