Five years ago a chemical plant invested $90,000 in a pumping station on a nearby river to provide the water required for their production process. Straight line depreciation is employed for tax purposes, using a 30-year life and zero salvage value. During the past five years, operating costs have been $8,000 per year, and is projected to remain constant for the remainder of service. A nearby city has offered to purchase the pumping station for $80,000 as it is in the process of developing a city water distribution system. The city is willing to sign a 10-year contract with the plant to provide the plant with its required volume of water for a price of $10,000 per year. Plant officials estimate that the salvage value of the pumping station 10 years hence will be about $35,000. The before-tax MARR is 10% per year. An effective income tax rate of 50% is to be assumed. Calculate the EUAC of the defender on an after-tax basis