I just can't figure out the Double-Declining Balance Method. please help

Comparing Three Depreciation Methods Dexter Industries purchased packaging equipment on January 8 for $223,600. The equipment was expected to have a useful life of four years, or 7,600 operating hours, and a residual value of $18,400. The equipmont was used for 2,660 hours during Year 1, 1,596 hours in Year 2, 2,128 hours in Year 3, and 1,216 hours in Year 4 Required: 1. Determine the amount of depreciation expense for the four 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 four years by each method. Round the answer for each year to the nearest whole dollar. Depreciation Expense Year Straight-Line Method Units-of-Activity Method Double-Declining- Balance Method Year 1 51,300 71,820 $ 180,000 x Year 2 $ 51,300 $ 43,092 $ 74,550 X 4 Year 3 $ 51,300 57,456 $ 37,275 X Year 4 $1 51,300 $ 32,832 12,675 X Total $ 205,200 $ 205,200 $ 273,600 x 2. What method yields the highest depreciation expense for Year 1? Double-declining-balance method 3. What method yields the most depreciation over the four-year life of the equipment? All three depreciation methods