Answer:
(a) Straight-line depreciation.
depreciation expense per year = ($315,900 - $15,900) / 4 = $75,000
(b) Activity method for 2014 and 2015, assuming that machine usage was 15,000 hours for 2014; 11,710 hours for 2015; 12,150 hours for 2016 and 1,140 hours for 2017.
depreciation expense per unit = $300,000 / 40,000 = $7.50 per unit
depreciation expense 2014 = $7.50 x 15,000 = $112,500
depreciation expense 2015 = $7.50 x 11,710 = $87,825
(c) Sum-of-the-years'-digits.
depreciation expense 2014 = $300,000 x 4/10 = $120,000
depreciation expense 2015 = $300,000 x 3/10 = $90,000
(d) Double-declining-balance.
depreciation expense 2014 = $315,900 x 2 x 1/4 = $157,950
depreciation expense 2015 = $157,950 x 2 x 1/4 = $78,975
depreciation expense 2016 = $78,975 x 2 x 1/4 = $39,487.50
depreciation expense 2017 = $39,487.50 - $15,900 = $23,587.50
