A company purchased a machine on January 1 of the current year for $750,000. Calculate the annual depreciation expense for cach 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