A civil engineer who owns his own design/build/operate company purchased a samll crane 3 years ago at a cost of $60,000. At that time, it was expected to be used for 10 years and then traded in its salvage value of $10,000. DUE to increased construction activities, the company would prefer to trade for a new, larger crane now that will cost $80,000. The company estimates that the old crane can be used, if necessary, for another 3 years, at which time it would have a $23,000 estimated market value. Its current market value is estimated to be $39,000, and if it is used for another 3 years, it will have M&O costs (esclusive of operator costs) of $17,000 per year. Determine the values of P,n,S, and AOC that should be used for the existing crane in a replacement analysis.