Equipment was purchased for $625k, Salvage was $25k, 10 year life. Estimated kilowatt hour life 1 million hours (1,000,000). Year I Asset used $500k kwi hours, Year 2 Asset used 55k kwhours, Year 3 asset used 90k kwhours. Prepare depreciation for first three years on the straightline basis, double declining balance, and units of production methods.