Mountain View Resorts purchased equipment at the beginning of 2021 for $34,000. Residual value at the end of an estimated four- year service life is expected to be $6,800. The machine operated for 2,000 hours in the first year and the company expects the machine to operate for a total of 10,000 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.) Depreciation Exponse Straight line Double-declining-balance Activity-based