comparing three depreciation methods dexter industries purchased packaging equipment on january 8 for $90,000. the equipment was expected to have a useful life of 3 years, or 18,000 operating hours, and a residual value of $3,600. the equipment was used for 7,200 hours during year 1, 5,400 hours in year 2, and 5,400 hours in year 3. required: 1. determine the amount of depreciation expense for the 3 years ending december 31, by (a) the straight-line method, (b) the units-of-activity method, and (c) the double-declining-balance method. also determine the total depreciation expense for the 3 years by each method. do not round intermediate calculations when determining the depreciation rate. round the final answers for each year to the nearest whole dollar. depreciation expense year straight-line method units-of-activity method double-declining- balance method year 1 $fill in the blank 1 $fill in the blank 2 $fill in the blank 3 year 2 fill in the blank 4 fill in the blank 5 fill in the blank 6 year 3 fill in the blank 7 fill in the blank 8 fill in the blank 9 total $fill in the blank 10 $fill in the blank 11 $fill in the blank 12 2. what method yields the highest depreciation expense for year 1? 3. what method yields the most depreciation over the 3-year life of the equipment?