3. 9.3 A civil engineer who owns his own design/build/operate company purchased a small crane 3 years ago at a cost of $65,000. At that time, it was expected to be used for 10 years and then traded in for its salvage value of $10,000. Due to increased construction activities, the company would prefer to trade for a new, larger crane now, which 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 $21,000 estimated market value. Its current market value is estimated to be $37,000, and if it is used for another 3 years, it will have M&O costs (exclusive of operator costs) of $19,000 per year. Determine the values of P, n, S, and AOC that should be used for the existing crane in a replacement analysis.