Calculate the depreciation expense for the following: (70 points) (use as separate sheet (s) for your answer; put your name on it) The Hartley Clinic purchased a new surgical laser for $90,000. The estimated salvage $5,000. The laser has a useful life of five years and the clinic expects to use it value is 10,000 hours. It was used 1,600 hours in year 2016; 2,200 hours in year 2017. (1) straight-line. (2) units-of-activity. (3) doubled-declining