Answer:
double declining balance depreciation:
$63,000 / 5 years = $12,600 or 20% per year
depreciation expense year 1 = $63,000 x 40% = $25,200
$63,000 - $25,200 = $37,800
depreciation expense year 2 = $37,800 x 40% = $15,120
units of production depreciation:
($63,000 - $3,000) / 100,000 hours = $0.60 per hour
Depreciation expense year 1 = 19,000 hours x $0.60 per hour = $11,400
Depreciation expense year 2 = 23,000 hours x $0.60 per hour = $13,800