Amer Company purchased a building for $900,000 on January 1, 2018. The estimated residual.2 value is $90,000, and the estimated useful life is 9 years. The straight-line method is used for depreciation. In 2021, Amer Co. changed its estimates to a total useful life of 7 years from the ?date of purchased and with a salvage value of $150,000. What is 2021 depreciation expense (3) 68,571 O 107.143 O 187.500 120,000