i got everything right except for question 2, i was completely lost, could you show me how to get it and what the answer is, please, and thank you so much

Bankeer Problem #3 (36 Total Points) De Waylander Coatings Company purchased waterproofing equipment on January 6 for $320,000. The equipment was expected to have a useful life of four years, or 20.000 operating hours, and a residual value of $35.000. The equipment was used for 7,200 hours during Year 1. 6.400 hours in Year 2. 4,400 hours in Year 3 and 2,000 hours in Year 4 Compute the depreciation expense for each year and total depreciation for all years combined using (a) Straight-line (b) Units-of-activity (c) Double-declining-balance NOTE: CLEARLY LABEL YOUR CALCULATIONS. Answers without calculations will not be considered. SL 320,000 - 35.000 = $71,250 Annual Dep. Amount 4 VOA b 320.000 - 35.000 20.000 = $14.25 per hour rate 13 Yr Straight line later. 114.25 x 70 - 102,600 106 - 254. SOY 2-14.25 6.400 : 41,200 3:14.25. quoo. 62,700 28,500 1 350,000