What is the Sum of the years answer? I tried 34,388 and 17,194 which were both incorrect

Question 3 Your answer is partially correct Wildhorse Company purchased equipment for $218,925 on October 1, 2017. It is estimated that the equipment will have a useful life of 8 years and a salvage value of $12,600 Estimated production is 39,300 units and estimated working hours are 19,900. During 2017, Wildhorse uses the equipment for 520 hours and the equipment produces 1,000 units. Compute depreciation expense under each of the following methods. Wildhorse is on a calendar-year basis ending December 31. (Round rate per hour and rate per unit to 2 decimal places, eg. 5.35 and final answers to O decimal places, e.g. 45,892.) (a) Straight-line method for 2017 (b) Activity method (units of output) for 2017 () Activity method (working hours) for 2017 (d) Sum-of-the-years'-digits method for 2019 (e) Double-declining-balance method for 2018 6,448 5,250 5,392 17,194 51,311