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 $34,000, which is expected to escalate to $35,000 this year and increase by $1,000 each year thereafter. The market value is now estimated to be $67,000$9,000k, 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 4 more years. A replacement study is to be performed. Determine the values of P, n, AOC for year 4 and S of this defender.

The value of P is $ (?).

The value of n is (?) years.

The AOC for year 4 is (?).

The value of S is $ (?).