21. (10 points) The Nichols Clinic purchased a new surgical laser for $80,000. The estimated residual 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. Instructions (a) Compute the annual depreciation for each of the five years under each of the following methods: (1) straight-line. (2) units-of-activity. (b) Which method would result in the lowest reported income in the first year? Which method would result in the lowest total reported income over the five-year period