1- straight-line

2- double-declining-balance

3- activity-based

University Car Wash built a deluxe car wash across the street from campus. The new machines cost $252,000 including installation. The company estimates that the equipment will have a residual value of $24,000. University Car Wash also estimates it will use the machine for six years or about 12,000 total hours. Actual use per year was as follows: Year Hours Used 3,000 1,700 1800 2.200 2,000 1,300 5 6