Mountain View Resorts purchased equipment at the beginning of 2021 for $42.000. Residual value at the end of an estimated four- year service life is expected to be $6.900 The machine operated for 1100 hours in the first year and the company expects the machine to operate for a total of 12.000 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.) Dopreciation Expense Straight line Double-declining balance Activity based