Layton Company purchased tool sharpening equipment on October 1 for $70,470. The equipment was expected to have a useful ilfe of 3 years or 5,940 operating houn and a residual vilue of $2,160. The equipment was used for 1,100 hours during Year 1,2,100 hours in Year 2,1,800 hours in Year 3 , and 940 hours in Year 4 . Required: Determine the amount of depreciation expense for the yea ended December 31, Year 1, Year 2, Year 3, and Year 4, by (a) the stralght-line method, (b) the units-ofactivity method, and (c) the double-decining-talance method. Note: FOR DECLINING BALANCE ONLY, round the multiplier to' four decimal places. Then round the answer for each year to the nearest whole dollar. b. Units-of-activity method c. Double-declining-balance method