Layton Company purchased tool sharpening equipmont on Oxtober 1 for $89,640. The equipment was expected to have a useful life of 3 vears or 7,560 operating hours, and a tesidual value of $2,700, The ecuipment was used for 1,400 hours during Year 1, 2,600 hours in Year 2, 2,300 hours in Year 3, and 1,260 hours in Year 4. Required: Determine the amount of depreciotion expense for the years ended December 31, Year 1, Year 2, Year 3, and Year 4, by (a) the straight-ine methed, (b) the unuts-of activity method, and (c) the double-declining-batance method. Note: FOR DECL.INING aALANCE ONLY, round the multiplier to four decimal places. Then round the answer for each year to the nearest whole dollar. a. Straight-line method b. Units-of-activity method c. Double-declining-balance method