A company purchased a machine on January 1 of the current year for $800,000. Calculate the annual depreciation expense for each year of the machines life (estimated at 5 years or 25,000 hours, with a salvage value of $50,000) using each of the below-mentioned methods. During the machines 5-year life its hourly usage was: 4,000; 5,000; 7,000; 6,000; and 3,000 hours. Show Your Work.

	Straight-line	Units-of-production	Double-declining balance
Year 1
Year 2
Year 3
Year 4
Year 5
Totals