On July 1, 2018, Brent purchases a new automobile for $40,000. He uses the car 80% for business and drives the car for business purposes as follows: 8,000 miles in 2018, 19,000 miles in 2019, 20,000 miles in 2020, and 15,000 miles in 2021.

Brent uses the actual cost method. [Assume that no 179 expensing is claimed and that 200% declining-balance cost recovery with the half-year convention is used. The recovery limitation for an auto placed in service in 2018 is as follows: $10,000 (first year), $16,000 (second year), $9,600 (third year), and $5,760 (fourth year).]

a. Compute his depreciation deductions for the years 2018, 2019, 2020, and 2021. What is Brent's adjusted basis in the auto on January 1, 2022?