Doug Smith Industries purchased warehouses for $55 million (no residual value) at the beginning of 2015. The warehouses were being depreciated over a 10-year life using the sum-of-the-years'-digits method. At the beginning of 2018, management decided to change to straight-line. Ignoring taxes, the 2018 adjusting entry will include a debit to depreciation expense of:

Multiple Choice

• $3.6 million

• $4 million

• $4.3 million

• $34 million