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The Hartley Clinic purchased a new surgical laser for $$90,000.$ The estimated salvage value is $$5,000.$ The laser has a useful life of five years and the clinic expects to use it $10,000$ hours. It was used $1,600$ hours in year $1$;$2,200$ hours in year $2$;$2,400$ hours in year $3$ ; $1,800$ hours in year $4$;$2,000$ hours in year $5.$

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Compute the annual depreciation for each of the five years under straight$-$line and units$-$of$-$activity methods.