Marin Company purchased equipment for $258,335 on October 1, 2017. It is estimated that the equipment will have a useful life of 8 years and a salvage value of $14,520. Estimated production is 40,300 units and estimated working hours are 20,100. During 2017, Marin uses the equipment for 520 hours and the equipment produces 1,000 units. Compute depreciation expense under each of the following methods. Marin is on a calendar-year basis ending December 31.

(a) Straight-line method for 2017 = 7619

(b) Activity method (units of output) for 2017 = 6050

(c) Activity method (working hours) for 2017 = 6307.65

(d) Sum-of-the-years'-digits method for 2019 = 45715

(e) Double-declining-balance method for 2018 = 60547

Are these answers correct?