Mountain View Resorts purchased equipment at the beginning of 2021 for $41,000 Residual value at the end of an estimated four-year service life is expected to be $7,400. The machine operated for 1000 hours in the first year and the company expects the machine to operate for a total of 9,000 hours over its four-year life. Calculate depreciation expense for 2021, using each of the following depreciation methods: (1) straight-line. (2) double-declining- balance, and (3) activity-based (Round your intermediate calculations to 2 decimal places.) 2 Depreciation Exponse Straight-line Double-declining balance Activity based