On January 1, 2018, Ameen Company purchased major pieces of manufacturing equipment for a total of $36 million. Ameen uses straight-line depreciation for financial statement reporting and MACRS for income tax reporting. At December 31, 2020, the book value of the equipment was $30 million and its tax basis was $20 million. At December 31, 2021, the book value of the equipment was $28 million and its tax basis was $12 million. There were no other temporary differences and no permanent differences. Pretax accounting income for 2021 was $50 million.