The Swifty Clinic purchased a new surgical laser for $81,000. The estinated salvage value is $4,500. The laser has a useful life of five years and the clinic expects to use it 8,500 hours. It was used 1,300 hours in year 1:1,900 hours in year 2; 2,100 hours in year 3;1,500 hours in year 4;1,700 hours in year 5 . Compute the annual depreciation for each of the five years under straight-line and units-of-activity methods