A machine purchased a year ago for $$85,000$ costs more to operate than anticipated. At the time of the purchase, it was expected to be used for $10$ years with annual maintenance costs of $$22,000$ and a salvage value of $$10,000.$ However, last year, it incurred a cost $$36000,$ which is expected to escalate to $$38,000$ this year and increase by $$2000$ each year thereafter. The market value is now estimated to be $$76000$$$9000$k$,$ where k is the number of years since the machine was purchased. It is now estimated that the machine will be useful for a maximum of $5\mathrm{.}00$ more years. A replacement study is to be performed. Determine the values of P$,$ n$,$ AOC for year $5\mathrm{.}00$ and S of this defender.