A company purchased a machine on January 1 of the current year for $750,000. Calculate the annual depreciation expense for each year of the machine's life (estimated at 5 years or 20,000 hours, with a salvage value of $75,000) using each of the below-mentioned methods. During the machine's 5-year life its hourly usage was: 3,000; 4,000; 5,000; 5,000; and 3,000 hours.

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

Required: 1) Complete the table