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A bin activator has an initial cost of $34,000 and a salvage value described by S=34,000-3300k where k is the number of years since the bin activator was purchased. The net annual revenue is estimated by R=5000+600k. The equipment will have a maximum useful life of 5 years. If the company's MARR is 4% per year, when is the best time to abandon the equipment?